alleryA bike covers two equal stretches at 40 km/h and 60 km/h. Its average speed over both?
A50 km/h
B45 km/h
C48 km/h
D52 km/h
Answer & Solution
Correct answer: C. 48 km/h
For equal distances the average is 2ab/(a+b) = 2 x 40 x 60 / 100 = 48 km/h.
Keep practising Time, Speed and Distance
Browse all Time, Speed and Distance questions for RRB NTPC, or explore more Quantitative Aptitude topics.
Related questions
Which vehicle dashboard instrument directly indicates instantaneous speed?What speed in kilometres per hour is exactly equivalent to 1 metre per second?How is average speed computed from total distance d and time t?A boy walking at 5 km/h is 6 minutes late, but at 6 km/h he is 6 minutes early. How far isTwo cyclists leave one point in opposite directions at 12 km/h and 8 km/h. How far apart aTo change a speed from m/s to km/h you multiply by which number?A vehicle running at 50 km/h would cover about how far in a single minute?A swimmer clocks 10 m/s in a short sprint. In km/h this is?