Model 3 Problems on average speed Section-Wise Topic Notes With Detailed Explanation And Example Questions
MOST IMPORTANT quantitative aptitude - 5 EXERCISES
The following question based on time & distance topic of quantitative aptitude
(a) 35
(b) 40
(c) 37.5
(d) 37
The correct answers to the above question in:
Answer: (c)
Using Rule 5,
Average speed of whole journey
= $({2xy}/{x + y})$ kmph
= ${2 × 50 × 30}/{50 + 30}$
= ${2 × 50 × 30}/80$ = 37.5 kmph
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Read more problems on average speed Based Quantitative Aptitude Questions and Answers
Question : 1
Durga walks 5 km from her home to school in 60 minutes, then bicycles back to home along the same route at 15 km per hour. Her sister Smriti makes the same round trip, but does so at half of Durga's average speed. How much time does Smriti spend on her round trip ?
a) 160 minutes
b) 80 minutes
c) 120 minutes
d) 40 minutes
Answer »Answer: (a)
Durga's average speed
= $({2xy}/{x + y})$ kmph.
= $({2 × 5 × 15}/{5 + 15})$ kmph.
= $({2 × 5 × 15}/20)$ kmph = $15/2$ kmph
Distance of School = 5 km.
Smriti's speed = $15/4$ kmph
∴ Required time = $2(5/{15/4})$ hours
= $({2 × 5 × 4}/15) = 8/3$ hours
= $(8/3 × 60)$ minutes = 160 minutes
Question : 2
A person travels 600 km by train at 80km/hr, 800 km by ship at 40 km/hr 500 km by aeroplane at 400 km/hr and 100 km by car at 50km/hr. What is the average speed for the entire distance ?
a) 60$5/123$ km/hr
b) 62 km/hr
c) 65$5/123$ km/hr
d) 60 km/hr
Answer »Answer: (c)
Using Rule 3,
Total time
= $600/80 + 800/40 + 500/400 + 100/50$
= $246/8$ hours.
Average speed
= ${600 + 800 + 500 +100}/{246/8}$
= ${2000 × 8}/246 = 65{5}/123$ km/hr.
Question : 3
To cover a distance of 216 km in 3.2 hours, what should be the average speed of the car in metre/second?
a) 37.5 metre/second
b) 18.75 metre/second
c) 67.5 metre/second
d) 33.75 metre/second
Answer »Answer: (b)
Required speed of car
= $\text"Distance"/ \text"Time"$
= $(216/{3.2})$ kmph.
= $(216/{3.2} × 5/18)$ m./sec.
= 18.75 m./sec.
Question : 4
A train runs at an average speed of 75 km/hr. If the distance to be covered is 1050 kms, how long will the train take to cover it ?
a) 15 hrs
b) 14 hrs
c) 13 hrs
d) 12 hrs
Answer »Answer: (b)
Using Rule 1,Distance = Speed × TimeSpeed = $\text"Distance"/\text"Time"$ , Time = $\text"Distance"/\text"Speed"$1 m/s = $18/5$ km/h, 1 km/h = $5/18$ m/s
Time = $\text"Distance"/\text"Speed"$
= $1050/75$ = 14 hours
Question : 5
At an average of 80 km/hr Shatabdi Express reaches Ranchi from Kolkata in 7 hrs. The distance between Kolkata and Ranchi is
a) 560 m.
b) 650 m.
c) 560 km.
d) 506 km.
Answer »Answer: (c)
Distance = Speed × Time
= (80 × 7) km. = 560 km.
Question : 6
One third of a certain journey is covered at the rate of 25 km/ hour, one-fourth at the rate of 30 km/hour and the rest at 50 km/ hour. The average speed for the whole journey is
a) 30 km/hour
b) 37$1/12$ km/hour
c) 35 km/hour
d) 33$1/3$ km/hour
Answer »Answer: (d)
Let the total distance be x km.
Total time = ${x/3}/25 + {x/4}/30 +{{5x}/12}/50$
= $x/75 + x/120 + x/120$
= $x/75 + x/60 = {4x + 5x}/300 = {3x}/100$ hours
Average speed
= $\text"Total distance"/\text"Time taken"$
= $x/{{3x}/100} = 100/3 = 33{1}/3$ kmph
Using Rule 18,If a man covers $1/x$ part of Journey at u km/h,$1/y$ part at v km/h and $1/z$ part at w km/hr and so on, then his average speed for the whole journey will be $1/{1/{xu} + 1/{yv} + 1/{zw} +...}$
Here, x = 3, u = 25
y = 4, v = 30
z = $12/5$ , w = 50
Average Speed= $1/{1/{xu} + 1/{yv} + 1/{zw}}$
= $1/{1/{3 × 25} + 1/{4 × 30} + 1/{12/5 × 50}}$
= $1/{1/75 + 1/120 + 1/120}$
= $1/{1/75 + 1/60} = 1/{{4 + 5}/300}$
= $300/9 = 100/3$
= 33$1/3$ km/hr.
GET time & distance PRACTICE TEST EXERCISES
Model 1 Basic Time & Distance using formula
Model 2 Vehicles in x/y of its usual speed
Model 3 Problems on average speed
Model 4 Time & Distance with Ratios
Model 5 Problems with Races
time & distance Shortcuts and Techniques with Examples
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Model 1 Basic Time & Distance using formula
Defination & Shortcuts … -
Model 2 Vehicles in x/y of its usual speed
Defination & Shortcuts … -
Model 3 Problems on average speed
Defination & Shortcuts … -
Model 4 Time & Distance with Ratios
Defination & Shortcuts … -
Model 5 Problems with Races
Defination & Shortcuts …
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