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SSC Selection Post 2020 PYQ — Question 73

SSC Selection Post - Matriculation Level 2020 - 9 Nov 2020 - Shift 1 • Quantitative Aptitude • Q73

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Dinesh is travelling on his bike. He will reach point P at 6 p.m. if he travels at 20 km/h. He will reach point P at 2 p.m. if he travels at 30 km/h. At what speed must he travel to reach point P at 4 p.m.?

Show answer & explanation

Correct answer: B

Explanation

The correct answer is option 2 i.e. 24 km/h.

Let distance = D

D20−D30=43D−2D60=4D60=4D=240\frac{D}{20} - \frac{D}{30} = 4 \\ \frac{3D - 2D}{60} = 4 \\ \frac{D}{60} = 4 \\ D = 240

Time from 6 a.m. to 4 p.m. = 10 hours

Required speed = 240/10 = 24 km/h