Suman travels the first 330 km by train at a speed of 110 km/hr and the next 165 km by bus at 55 km/hr. Ignoring the buffer time between different modes of travel, the average speed (in km/hr) for her tour was:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e 82.5.
Time by train = 330 ÷ 110 = 3 hours
Time by bus = 165 ÷ 55 = 3 hours
Total distance = 330s + 165 = 495 km
Total time = 3 + 3 = 6 hours
Average speed = Total distance ÷ Total time = 495 ÷ 6 = 82.5