SarkariPYQ

SSC Selection Post 2022 PYQ — Question 75

SSC Selection Post - Matriculation Level - 05 Aug 2022 - Shift 1 • Quantitative Aptitude • Q75

Back to paper

A car travels a certain journey at 40 km/h and an equal distance more at 60 km/h. The average speed for the whole journey is:

Show answer & explanation

Correct answer: D

Explanation

The correct answer is Option 4 i.e. 48 km/h

When equal distances are covered at different speeds, Average Speed = 2xyx+y\frac{2xy}{x + y}

= 2×40×6040+60\frac{2 \times 40 \times 60}{40 + 60}  

= 4800100\frac{4800}{100} = 48 km/h