A man travelled for first 5 hours at the speed of 20 km/hr. He travelled for next 3 hours at the speed of 10 km/hr. What is his average speed (in km/hr) for the whole journey?
Show answer & explanation
Correct answer: B
Explanation
Given:
Speed for the first 5 hours = 20 km/h
Speed for the next 3 hours = 10 km/h
According to the formula:
Average Speed = Total Distance / Total Time
First Distance = 20 × 5 = 100 km
Second Distance = 10 × 3 = 30 km
Total Distance = 100 + 30 = 130 km
Total Time = 5 + 3 = 8 hours
Average Speed = 130 / 8 = 65/4 km/h