In this video sums related to relative speed of boat in standstill water stream and in a water stream having speed in the same direction and also in the opposite direction have been discussed. Watch the video and comment below. If you have sum of boat and stream then post it in the comment box.

Sum No-1: Speed of a boat in still water is 9 km per hr. If the boat goes 54 km downstream in 4 hours.; find the the speed of the stream. Sum No-2: The speed of a boat in still water is 10 km per hour. If the boat goes 35 km upstream in 5 hrs. ; find the speed of the stream.