Question

a motorboat whose speed is 9 km per hour in still water takes 1 hour more to go 12 km upstream then to return downstream to the same distance find the speed of the stream​

Answer 1

Letspeedofstream=xkm/hr

then( 9+x15)+( 9−x5 )=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