Question

The speed of a motor boat in downstream is 45 km per hour and the speed of the stream is 9 kilometer per hour then the speed of the motor boat in upstream is-​

Answer 1

Answer:

Correct option is A)

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