a motor boat covers a certain distance downstream in a river in 9 hour

1.	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» 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

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»

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

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