Question

If the speed of the boat in still water is 12kmph and the speed of the stream

is3kmph ,then the time to travel 36km in up stream is
please fast​

Answer 1

Answer : 4 hours

Explanation:

✓ The speed of the boat upstream = speed of boat in still water + speed of water upstream

= ( 12kmph ) + ( -3kmph )

= 9kmph

✓ Distance travelled = 36km

=> Time taken = Distance travelled / Speed

=> T = ( 36km )/( 9kmph ) = 4h

Answer 2

Answer:

Boat speed in siti water =12kmph

Upstream speed of the boat=36/4=9kmph

Speed of the stream=Boat speed in still water minus upstream speed of the boat

=12–9=3kmph

Downstream speed of the boat=12+3=15kmph

Time taken by the boat to cover downstream distance of 36 kms to be divided by the downstream speed of the boat=36/15=2.4 hours