Math, asked by mangan1gj, 7 months ago

The speed of motor boat in still water is 9 km/hr in a river. It covers 12 km downstream and the same distance upstream in a total time of 3 hours. Find the speed of the current of the river.

Answers

Answered by mastermimd2

1

Step-by-step explanation:

Let speed of stream=xkm/hr then(9+x15)+(9−x15)=3+(43)hour15(81−x29−x+9+x)=(415)72=81−x2∴x2=81−72

∴x=3km/hr

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