Question

Aman can row down stream 20 km in 2hrs and up stream in 4km in 2 hour find his speed of rowing

Answer 1

Answer:  6km/h

Step-by-step explanation:

velocity (upstream) = Vu  = 4/2 = 2km/h

velocity (downstream)  = Vd = 20/2 = 10km/h

Velocity of the stream = Vs  --->

Velocity of the man = Vm

(in ---> direction)  

Vs - Vm  = -2

Vs = Vm -2  -------(i)

Vs + Vm = 10

Substitute (i)

Vm -2 Vm = 10

2Vm -2 = 10

2Vm = 12

Vm = 6km/h