Question

A motor boat covers a certain distance downstream in a river in 1 hour . It covers the same distance upstream in 1 and half hours . The speed of water is 2 km/hr . The speed of boat in still water is?

Answer 1

Answer:

19.5 km/hr

Step-by-step explanation:

Downstream speed

x+y=d/3 or =3(x+y).........1

Upstream speed

=x−y=d×27

or d=72(x−y).........2

Compare both the distance

3(x+y)=72(x−y)

n

x= 13y

Hence, y = Speed of current

= 1.5 km/h

x = 13 X 1.5

x =19.5 km/h

(speed of boat in still water )