Exams › SSC CGL (Prelims) › General

Rohit covers half of his journey at 15 km/h and the remaining half at 10 km/h. His average speed is:

1. 12 km/h
2. 12.5 km/h
3. 13 km/h
4. 14 km/h

Correct answer: 12 km/h

Solution

When equal distances are covered at two different speeds, average speed is \(\frac{2ab}{a+b}\). Substituting \(a=15\) and \(b=10\) gives \(\frac{2\cdot15\cdot10}{15+10}=12\) km/h.

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