Question

2. A car travels the first half of a distance
between two places a speed of 30 km/hr
and the second half of the distance a
50 km/hr. The average speed of the car for
the whole journey is
1) 42.5 km/hr
2) 40.0 km/hr
3) 37.5 km/hr
4) 35.0 km/hr​

Answer 1

Explanation:

Let Distance be 150 km

Time at 1st half distance=Distance/Time=150/30=5 hr

Time at 2nd half distance=150/50=3 hr

Average speed =Total distance/Total time taken

→150+150/5+3

→300/8

→37.5 km/hr

[Option (3) supports the answer]