The distance travelled by the down side stream by boat in 3hours is 12 km more than the distance travelled by the up stream at the same time. what is the speed of the current in kmph
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80 km
Let the distance to be covered by the boat when it is travelling against the stream be x.The boat goes down the river at a speed of 20 + 4 = 24 km/h and up the river at a speed of 20 - 4 = 16 km/h.Since the time taken is same 120/24 = x/16Therefore, x = 80 km.
10 km/hr.
Boats's rate in still water = (15 - 2.5) km/hr = 12.5 km/hr.Boat's rate against the current = (12.5 - 2.5) km/hr = 10 km/hr.
Let the distance to be covered by the boat when it is travelling against the stream be x.The boat goes down the river at a speed of 20 + 4 = 24 km/h and up the river at a speed of 20 - 4 = 16 km/h.Since the time taken is same 120/24 = x/16Therefore, x = 80 km.
10 km/hr.
Boats's rate in still water = (15 - 2.5) km/hr = 12.5 km/hr.Boat's rate against the current = (12.5 - 2.5) km/hr = 10 km/hr.
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