A man in a train notices that he can count 21 telephone posts in one minute. If they are known to be 50 metres apart, then at what speed is the train travelling? `55\ k m//h r` b. `\ 60\ k m//h r` c. `57\ k m//h r` d. `63\ k m//h r`

A man in train notices that he can count 21 telephone posts in one minute. If they are known to be 50 metres apart, then at what speed is the train travelling?

A man in a train notices that he can count 21 telephone posts in one minute.If they are known to be 50 metres apart,then at what speed is the train travelling? 55backslash km/hr b.backslash60backslash km/hr c.57backslash km/hrd.63backslash km/hr

A train 125 m long passes a man, running at 5 kmph in the same direction in which the train is going, in 10 seconds. The speed of the train is: 45 k m//h r b. 50 k m//h r c. 54 k m//h r d. 55 k m//h r

A man's speed with the current is 15 km / hr and the speed of the current is 2.5 km/ hr. The man's speed against the current is: 8. 5\ k m//h r b. \ 9\ k m//h r c. 10\ k m//h r d. 12. k m//h r

A train travels at a speed of 30 km/hr for 12 minutes and at a speed of 4 km/hr for the next 8 minutes. The average speed of the train for this journey is 30 k m//h r b. 36 k m//h r c. 37. k m//h r d. 48 k m//h r

Two trains start simultaneously (with uniform speeds) from two stations 270 km apart, each to the opposite station; they reach their destinations in 6 1/4 hours and 4 hours after they meet. The rate at which the slower train travels is 16 k m//h r b. 24 k m//h r c. 25 k m//h r d. 30 k m//h r

A journey of 192 km between two cities takes 2 hours less by a fast train than by a slow train. If the average speed of the slow train is 16 km/hr less than that of the fast train, then the average speed of the fast train is 32 k m//h r b. 48 k m//h r c. 36 k m//h r d. 64 k m//h r

A man rows to a place 48 km distant and back in 14 hours. He finds that he can row 4 km with the stream in the same time as 3 km against the stream. The rate of the stream is : 1 k m//h r b. 1. 8 k m//h r c. 1. 5 k m//h r d. 3. 5 k m//h r

A car covers the first 39 kms of its journey I 45 minutes and covers the remaining 25 km in 3 minutes. What is the average speed of the car? 40 k m//h r b. 48 k m//h r c. 49 k m//h r d. 64 k m//h r e. none of these