Question

Ritu can row downstream 20km in 2 hours and upstream 4km in 2 hours. Find her speed of rowing in
still water and the speed of the current.
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Answer 1

Answer:

speed of boat in still water is 6 kilometre per hour and speed of bboatis 4 km/h.

Step-by-step explanation:

speed of boat in still water is x kilometre per hour and speed of bboatis ykm/h.

boat towards down the stream

20/x+y = 2 (1)

boat upstream

4 /x-y = 2 (2)

20 = 2x + 2y(3)

4 = 2x-2y(4)

simplify the eq 4 and 3 by div both by 2

i.e you'll get

10 = x+y(5)

2 = x-y (6)

from 5 and 6

we get x = 6 and y = 4 .