Question

a motor boat whose speed is 9 km/hr is still on water. goes 12 km downstream and come back in time of 3 hours .find the speed of the stream​

Answer 1

Speed of motor boats = 9km/hr

Speed of stream = y km/hr

Speed of downstream = ( 9+y ) km/hr

Speed of upstream = ( 9+y )km/hr

$speed = \frac{distance}{time}$

According to question :

T1 + T2 = 3hr

$( \frac{12}{9} + y) + ( \frac{12}{9} - y) = 3$

Solving this

we are gonna get

answers

as

y=3

Speed of stream = 3km/hr

Thanks

Mark brainliest

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