Suman covers a certain distance by car, driving at 22 km/hr, and he returns to the starting point, riding on a scooter at a speed of 17 km/hr. Find the average speed for the whole journey.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 19km/hr .
Average speed = 2ab ÷ (a + b)
a = 22, b = 17
Average speed = 2 × 22 × 17 ÷ (22 + 17)
= 748 ÷ 39
= 19 km/hr