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SSC Selection Post 2022 PYQ — Question 56

SSC Selection Post - Matriculation Level - 1 Aug 2022 - Shift 1 • Quantitative Aptitude • Q56

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Tejasvi drove at an average speed of 35 miles/h for the first 35 miles of a trip and then at an average speed of 65 miles/h for the remaining 35 miles of the trip. If she made no stops during the trip, what was her average speed (in miles/h) for the entire trip?

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Correct answer: D

Explanation

The correct answer is option 4 i.e. 45.5.

Time₁ = 353535\over35 = 1 hr

Time₂ = 356535\over65 = 7137\over13 hr

Total distance = 70 miles

Total time = 1 + 7137\over13 = 201320\over13 hr

Average speed = 70201370 \over{20\over13} = (70×13)20(70 × 13) \over 20 = 45.5 miles/h