Exams › SSC CGL (Prelims) › General

A runner has to cover a distance of 100 km. After running for 5 hours 20 minutes, he finds that he has completed \(\tfrac{2}{3}\) of the total distance. What is his speed in km/h?

1. 12.5 km/h
2. 17.5 km/h
3. 16.25 km/h
4. 15.5 km/h

Correct answer: 12.5 km/h

Solution

He has covered \(\tfrac{2}{3}\times 100 = 66\tfrac{2}{3}\) km in 5 hours 20 minutes. Since 5 hours 20 minutes = \(\tfrac{16}{3}\) hours, speed = distance/time = \(\frac{200/3}{16/3} = 12.5\) km/h.

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