Question

A boy walks to his school at a distance of 6km with a constant speed of 2.5kmph and walks back with a constant speed of 4kmph. His average speed for the round trip expressed in kmph is
a)
24 13
b)
40 13
c) 3 d)
1 2
[ ]
5. A train runs past a telegraph pole in 15s and through a tunnel of length 450m in 45s. The length of the train is [ ] a) 225m b) 325m c) 425m d) 450m
6. A car covers 60km with a uniform speed of 120kmph and the next 60km with a uniform speed of 80kmph. The total time taken by the car is [ ] a) 75min b) 60min c) 55min d) 80min
7. A person takes time t to go once around a circular path of diameter 2R. The speed (v) of this person would be [ ]
a)
t 2 R 
b)
2 R t 
c)
2R t 
d) 2 R.t 
8. A motor cyclist drives A to B with a uniform speed of 30kmph and returns back with a speed of 20kmph. Then the average speed is [ ] a) 20kmph b) 24kmph c) 42kmph d) 52kmph
9. A runner makes one lap around a 200m circular track in 25s. The average speed of the runner is a) 0 b) 4ms–1 c) 8ms–1 d) 16ms–1
10. If a car covers first
2/ 5
th of the total distance with a speed v1 and the remaining
3/ 5
th of the total
distance with a speed v2, then its average speed is

Answer 1

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