Question

A motor boat whose speed is 18 kmph in still takes 1 hour more to go 24 km up stream than to return to the same spot. Find the speed of stream

Answer 1

average speed is equal to Total distance by total time taken

=2 into 2400 by 2 into 60=2*2400/2*60=40 metre per second

I converted all the values into metre per second and metres and seconds

Answer 2

Answer:

Let the speed of stream be x km / hr

For upstream = ( 18 - x ) km / hr

For downstream = ( 18 + x ) km / hr

A.T.Q.

24 / 18 - x - 24 / 18 + x = 1

48 x = 324 - x²

x² + 48 x - 324 = 0

( x + 54 ) ( x - 6 ) = 0

x = - 54 or x = 6

Since speed can't be negative .

Therefore , speed of the stream is 6 km / hr .