Manoj completed 30 km of his journey at 6 km/h and the remaining 40 km in 5 hours. His average speed for the whole journey is:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 7 km/h.
Time for 30 km at 6 km/h = = 5 hours
Time for the remaining 40 km = 5 hours
Total distance = 30 + 40 = 70 km
Total time = 5 + 5 = 10 hours
Average speed = = 7 km/h