Question
If a boat travels 15 km more in downstream than in
upstream in 3 hours and if the speed of the Boat in still water is 17 kmph. Find the distance travelled by boat in downstream in 6 hours?Solution
Difference in travelling distance in downstream and upstream in 1 hour is 5 km  Let the speed of upstream be x km/hr  Speed of downstream = x + 5 km/hr  speed of the Boat in still water = 17 km/hr  1/2 x (x + x + 5) = 17  2x + 5 = 34  x = 14.5 km/hr  Speed of downstream = 14.5 + 5 = 19.5 km/hr  Distance travelled in 6 hours = 19.5 x 6 = 117 km
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