A boat goes 150 km upstream in 30 hours and a distance of 217 km downstream in 31 hours. Find the speed of the boat in still water. (In kmph)
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 6.
Upstream speed = 150/30 = 5 kmph
Downstream speed = 217/31 = 7 kmph
Boat's speed in still water = (5 + 7)/2 = 6 kmph