A person covers the first 25 km in 60 minutes and the next 38 km in 30 minutes. What is his average speed for the whole journey?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 2 i.e. 42 km/h.
Total distance = 25 + 38 = 63 km
Total time = 60 min + 30 min = 90 min = 90/60 = 1.5 hours
Average speed = Total distance/total time
= 63/1.5 = 42 km/h