Question

1 point
21. The speed of boat in still
water is 8 km/hr and the speed
of stream is 3 km/hr. Now the
time in which the boat can
cover 15 km upstream and 22
km downstream is *
O
3 hrs.
O 2 hrs.
O 5 hrs.
O 11 hrs.​

Answer 1

Answer:

speed of the boat=8 km/hr

speed of the stream=3 km/hr

If the speed of the boat in still water is x km/hr and speed of the stream is y km/hr then speed upstream=(x−y) km/hr

Therefore speed upstream=8−3=5 km/hr

distance=30 km

time=  

speed

distance

​  

 

⇒time=  

5

30

​  

 

⇒time=6 hrs

Step-by-step explanation: