Question

3.
A man moves from station A to B with speed 5 km/h for half time and with speed 15 km/h for remaining half
time. The average speed of the man over the entire journey is
(1) 10 km/h
(2) 12 km/h
(3) 6 km/h
(4) 25 km/h​

Answer 1

Answer:

6 km/h

Explanation:

let, required time for 1st half is x/2.

distance=5x/2

required time for next half is x/6 hr.

total time= 5x/6,total distance = 5x km

average speed = distance/time= 6km/hr