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SSC Selection Post 2022 PYQ — Question 72

SSC Selection Post - Matriculation Level 2022 - 2 Aug 2022 - Shift 1 • Quantitative Aptitude • Q72

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Sudhir runs a certain distance at a speed of 13km/h for 7 minutes. He again walks for 7 minutes at a speed of 3 km/h. What is his average speed for the whole journey?

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Correct answer: C

Explanation

The correct answer is option 3 i.e. 8 km/h.

Running distance = 13×760=916013 \times \frac{7}{60} = \frac{91}{60} km
Walking distance = 3×760=21603 \times \frac{7}{60} = \frac{21}{60}km
Total distance = 91+2160=11260\frac{91 + 21}{60} = \frac{112}{60}km
Total time = 1460=730\frac{14}{60} = \frac{7}{30} hours

Average speed = 11260730=11260×307=3360420\frac{\frac{112}{60}}{\frac{7}{30}} = \frac{112}{60} \times \frac{30}{7} = \frac{3360}{420} = 8 km/h