Question

Deepti can row downstream 20 km in2 hr and upstream 4 km in 2 hr . Find her speed of rowing in still water and the speed of the current

Answer 1

Speed of still water be x
Speed of current be y
Speed downstream=(x+y)
Speed upstream=(x-y)
Case 1(downstream)
Distnce=20km
Time=2hrs
Speed=(x+y)=10
Case 2(upstream)
Distance 4
Time 2
Speed (x-y) =2
x-y=2...........(1)
x+y=10..........(2)
2x=12
x=6
On substituting value of x in any of the equation we get y=4