A car goes from P to Q at 40 km/h and returns from Q to P at 60 km/h. What is its average speed for the whole journey?

A. 48 km/h

B. 50 km/h

C. 52 km/h

D. 45 km/h

Doubtly AI Asked 27 Oct 2026 AI-generated · not yet verified ssc cgl Save WhatsApp Report

1 answer

Best answer

Answer: A. 48 km/h

Answer: (A) 48 km/h

Shortcut: for equal distances, average speed = \(\frac{2xy}{x+y} = \frac{2 \times 40 \times 60}{100} = 48\) km/h.

Trap: 50 km/h is the simple average of the speeds, which is wrong because more time is spent at the slower speed.

Doubtly AI · 27 Oct 2026 AI-generated · not yet verified Report

Was this answer helpful?