SSC CHSL 2020 · PYQ · Time Speed Distance · medium
A man divided his journey into three parts of distances of 18 km, 20 km and 27 km. He travelled the distances at the speeds of 6 km/h, 5 km/h and 9 km/h respectively. What was his average speed during the entire journey?
A.5.5 km/h
B.7.5 km/h
C.4.5 km/h
D.6.5 km/h✓ Correct
Explanation
Total distance = 18+20+27 = 65 km. Total time = 18/6 + 20/5 + 27/9 = 3+4+3 = 10 hours. Average speed = 65/10 = 6.5 km/h.
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