Question

Ritu can row downstream 20 km in 2 hours and upstream 4 km in 2 hours find her speed of flowing in still water and the speed of the current

Answer 1

Answer:speed in still water =6 km /h and speed of current =4km/h

Step-by-step explanation:

Consider speed of stream as y and speed of ritu in still water as x

Speed upstream= x-y

Speed downstream=x+y

Also speed=distance/time

Then time=distance/speed

When upstream,

4/x-y=2

=>x-y=4/2 =>x-y=2 —————->1

When downstream,

20/x+y=2

=>x+y=20/2

x+y=10 ————————————>2

Adding eqn. 1 and 2

       x+y=10

       x-y=2

————————

         2x=12

———————-

=>x=12/2=6

Similarly

y=10-x=10-6

y=4

Answer 2

Answer:

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