Question

a motor boat covers a certain distance downstream in a river in 9 hours it covers the same distance upstream in 10 hours the speed of the stream is one kilometre per hour find the speed of boat in still water

Answer 1

Answer:

hence speed of boat in still water=19 km/hr

Step-by-step explanation:

Let speed of boat =x km/hr

speed of stream=1 km/hr

speed in downstream=x+1

distance covered in 9 hrs

=(x+1)*9

speed in upstream=x-1

distance in 10 hrs

=10*(x-1)

Both these distances are same

So 10*(x-1)=9(x+1)

10x-10=9x+9

10x-9x=9+10

x=19 km/hr

hence speed of boat in still water=19 km/hr