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the speed of a boat in still water is 15 kilometre per hour and the speed of a stream is 5 kilometre per hour find the time taken by the board to cover 40 km upstream ​

Respuesta :

tramserran

Answer:  4 hours

Step-by-step explanation:

distance (d) = [rate (r) - current (c)] × time (t)

Given: d = 40, r = 15, c = 5

40 = (15 - 5)t

40 = 10t

4 = t

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