Question

A motorboat goes downstream and covers a distance in 4 hours while it covers the same distance upstream in 5 hours if the speed of the stream is 3 kilometre per hour find the speed of the motor boat in still water​

Answer 1

Answer:

Step-by-step explanation:

Let the speed of the steamer in still water be x km/h. Then,

The speed downstream = (x+3) km/h

The speed upstream = (x-3) km/h

The distance covered in 4 hours while going downstream = 4(x+3) km

The distance covered in 5 hours while going upstream = 5(x-3) km

But,each of these distances in the distance between the two ports which is the same.

4 (x+3) = 5 (x-3)

4x + 12 = 5x - 15

4x -5x = -15 -12

-x = -27

x = 27

Hence, speed of the stream in still water = 27 km/h.

Answer 2

Step-by-step explanation:

heyyy mate here is urr answer...

let the speed of the motor boat be X

speed of motor boat in downstream = (X+3) km/hr.

speed of motor boat in upstream = (x-3) km/hr.

so, distance= time x speed

so, distance travelled by speed of X+3=4(X+3)

distance travelled by speed of x-3=5(X+3)

so, distance travelled was same so

=: 4(X+3) = 5(x-3)

=: 4x+12= 5x-15

=: 4x-5x= -15-12

=: -x= -27

=: X= 27

May it helps u...

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