a motorboat whose speed is 90 metre per hour in still water goes 15 km downstream and comes back in a total time of three hours 45 minutes find the speed of the stream
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Answer:
3 km/h
Step-by-step explanation:
Letspeedofstream=xkm/hr
then(
9+x
15
)+(
9−x
15
)=3+(
4
3
)hour
15(
81−x
2
9−x+9+x
)=(
4
15
)
72=81−x
2
∴x
2
=81−72
∴x=3km/hr
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