The speed of a boat in still water is 12 km/hr. It takes twice as long to go upstream to a point as to return downstream to the starting point, then the speed of the stream is :

A fisherman is rowing a boat. He takes 6 hours to row 48 km upstream whereas he takes 3 hours to go to the same distance downstream.

Based on the above information, which of the following are correct?

(A) His speed of rowing in still water is 10 km/hour.

(B) The speed of the stream is 3 km/hour.

(C) The average speed of the fisherman is 32/3 km/hour.

(D) The speed of the stream is 4 km/hour.

Choose the correct answer from the options given below:

In a 500 metres race, the ratio of speeds of two participants Meena and Kamal is 4:5 respectively. If Meena has a start of 200 metres, find the distance by which Meena wins.

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

In a 1000 m race, Arun reaches the final point in 56 seconds and Pradeep reaches in 70 seconds. By how much distance does Arun beat Pradeep?

A boat covers a distance of 51 km downstream in 3 hours and takes $7\frac{2}{7}$ hours to cover the same distance upstream. If the boat's speed in still water is 12 km/hrs, then the speed of the stream is:

A motorboat can row at the speed of 10 km/h in still water. If the river is flowing at 5 km/h, and it takes 20 hours for a round trip, then the distance between the two places is