Question

A motor boat goes down the stream 30 km and again returns to the
starting point in a total time of 4 hours and 30 minutes. If the speed of the
stream is 15 km/hr, then find the speed of the motor boat in still water.​

Answer 1

Answer:

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Answer 2

Answer:

Let the speed of the motor boat in still water be x

speed of the stream be y

Then,

30 = 4.5------------>equation 1

--------------

x - y

given that y=15 km/h

Substituting y values in equation 1 gives,

30 = 4.5

-------------

x - 15

30 = 4.5(x-15)

30 =4.5x - 67.5

30 + 67.5 = 4.5x

97.5 = 4.5x

97.5 = x

-------------

4.5

x = 21.6 km/h

So, the speed of the boat is 21.6 km/h