Nirav can row 12 kmph in still water. He took twice as much time to row up than as to row down the same distance in the river. Calculate the speed of the current.
If the speed of stream gets increased by 2 km/hr, the time in which a particular distance is covered going downstream decreases by 20%. Find the original downstream speed (in km/hr).
Train A takes 22 sec to cross a pole. The length of the train is 462 m and it crosses a platform in 45 sec. The length of the platform is ________ m.
A boat goes 20 km upstream and returns in 6 hours. If the speed of the boat in still water is 7.5 km/hr, what is the speed of the stream?
A person travels from A to B with a speed of 6 km/hr in 120 min, if his speed becomes 15 km/hr, then find the difference in time.
1). 80 mins
2). 72 mins
3). 48 mins
4). 36 mins