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SSC GD 2023 PYQ — Question 60

SSC GD Constable (English) - 23 Jan 2023 - Shift 2 • Quantitative Aptitude • Q60

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A person covers a certain distance by bullet train at 84 km/h and returns back to the starting point by bus at a speed of 66 km/h. Find the average speed of the person for the whole journey.

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Correct answer: B

Explanation

The correct answer is Option 2 i.e. 73.92 km/h.

A person covers a certain distance by bullet train at 84 km/h

Returns to the starting point by bus at a speed of 66 km/h

Average speed = (2×s1×s2)(s1+s2)(2 × s1 × s2)\over (s1 + s2)

where, s1 and s2 are respective speeds

According to the given question

Average speed = (2×84×66)(84+66)(2 × 84 × 66)\over (84 + 66) = 1108815011088\over150  = 73.92 km/hr