A man travelled for first 6 hours at the speed of 40 km/hr. He travelled for next 4 hours at the speed of 15 km/hr. What is his average speed (in km/hr) for the whole journey?
Show answer & explanation
Correct answer: B
Explanation
Distance in the first 6 hours = 40 × 6 = 240 km
Distance in the next 4 hours = 15 × 4 = 60 km
Total distance = 300 km
Total time = 10 hours
Average speed = 300 ÷ 10 = 30 km/h