A man rows a boat downstream 30 km and upstream 20 km. It takes him 5 hours to cover each distance. Which of the following are TRUE?

(A) The speed of the boat in still water is 10 km/hr.

(B) The speed of the boat in still water is 5 km/hr.

(C) The speed of the current is 1 km/hr.

(D) The speed of the current is 6 km/hr.

Choose the correct answer from the options given below:

A motorboat completes a round trip of 150 km between two places A and B in 8 hours. If downstream speed of the motorboat is 25 km/hr, then the upstream speed of the motorboat is

A swimmer whose speed in swimming pool is 5 km/h, swims between two points in a river and returns back to starting point. He took 20 minutes more to cover the distance upstream than to cover downstream. If the speed of stream is 2 km/h, then the distance between two points is

In a 500 m race, the ratio of speeds of two participants, A and B, is 4:5 respectively. If A has a start of 180 m, then the distance by which A wins is

A boat goes downstream at a speed of 18 km/hr and upstream at a speed of 'm' km/hr. The boat travelled 90 km downstream in a river and then returned back taking altogether 12.5 hours. Then which of the following are true ?

A. $m = 12$

B. $m = 15$

C. Speed of water current is 3 km/hr

D. Speed of water current is 1.5 km/hr

Choose the correct answer from the options given below:

In a 600 m race, A beats B by 37.5 m or by 10 seconds, then the time taken by B to finish the race is

In a kilometer race, A beats B by 100 meters and B beats C by 125 meters. Then A beats C by