CTET PAPER II 2019 · PYQ · Speed and Motion · easy
Myra cycles to a friend's house 5 km away to deliver a packet. She goes at a speed of 12 km/hour and returns at a speed of 8 km/h. Her average speed during the whole trip is –
A.20 km/h
B.9.6 km/h✓ Correct
C.10 km/h
D.5 m/s
Explanation
For average speed during a round trip with different speeds, use harmonic mean: Average speed = 2v₁v₂/(v₁+v₂) = 2(12)(8)/(12+8) = 192/20 = 9.6 km/h.
💡 Practice unlimited CTET PAPER II PYQs + AI-tracked progress on each topic. Sign up free →
Want more CTET PAPER II practice?
Free daily 10-Q quiz · adaptive mocks · 4,000+ verified PYQs · AI doubt solver in Hindi + English