Question

speed of the boat in the still water is 15 km/ hr and speed of the stream is 5 km / hr. find time taken by biat to cover. • 40 km upstreams , • 36 km downstreams​

Answer 1

Step-by-step explanation:

Speed of boat in still water be = x km/hr

speed of stream be = y km/hr

So,

SO,

SPEED IN DOWNSTREAM = X+Y

SPEED IN UPSTREAM = X-Y

so,

speed of boat in downstream = 20 km/hr

speed of boat in upstream = 10 km/hr

As, we know

Time = distance/speed

so,

time in covering 40km upstream = 40/10

= 4hr

similarily,

Time taken in covering 36km downstream will be = 36/20 hr that is equal to 1.8hr

plsssssssssssssssss mark this as brainliest i request you