Prakhar goes from his home to school at a speed of 24 km/hr and returns at the speed of 36 km/hr. Find the average speed for the whole journey .
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 28.8 km/hr.
Average speed = (2 × 24 × 36) / (24 + 36)
= (2 × 864) / 60
= 1728 / 60 = 28.8 km/h