Question

A boat can go 20 km upstream and 30 km downstream in 3 hours. It can go 20 km downstream and 10 km upstream in 1*2/3 hours. Find the speed of the boat in still water and the speed of the stream.

Answer 1

Answer:

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here is the solution

Step-by-step explanation:

let the speed of the boat be x km in per hour in still water

speed of stream be y km per hour

speed up stream is (x-y) km per hour.

speed downstream is ( x +y) km per hour.

x+y-y +x = 20/3 +30/3

2x = 50/3 km per hour.

x = 25/3 km per hour

Distance covered by the boat upstream in one hour is 10 km.

Speed of stream = 10-25/3

=5/3=2 2/3 km per hour

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