A person completes 80 km of a journey at 10 km/h and the remaining 70 km in 7 hours. His average speed for the whole journey is:
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 10 km/h.
First part time = 80/10 = 8 hours
Total distance = 80 + 70 = 150 km
Total time = 8 + 7 = 15 hours
Average speed = 150/15 = 10 km/h