Model 3 Problems on average speed Section-Wise Topic Notes With Detailed Explanation And Example Questions

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

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

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

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

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.

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