Question

.Ritu can row downstream 20km in 5 hours and upstream 4km in 2

hours. Find her speed in still water and speed of current.
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Answer 1

Answer:

I have not studed it till now

Answer 2

Answer:

Speed of boat in still water = 3 kmph

Speed of stream = 1 kmph

Step-by-step explanation:

Given

Distance traveled in Downstream = 20 km

Downstream time = 5 hours

Distance traveled in Upstream = 4 km

Upstream time = 2 hours

Formula Used:

$distance \: = speed \times time$

Downstream Speed = u+v

Upstream Speed = u-v

where, u is speed of boat in still water and v is rate of stream

Solution:

Downstream speed = 20/5= 4 kmph

Upstream Speed = 4/2 = 2 kmph

u + v = 4

u - v = 2

Solve

u = 3 kmph

v = 1 kmph

Answer:

Speed of boat in still water = 3 kmph

Speed of stream = 1 kmph