The average speed of a cyclist who covers first, second and third
The average speed of a cyclist who covers first, second and third km at 20, 16 and 12 km/hr respectively (in kmph) is:
(a) 16.24
(b) 16
(c) 15.66
(d) 15.32
Answer: (d) 15.32
Solution:-
Total distance covered = 3 km
Total time taken = (1/20 + 1/16 + 1/12) = 47/240
Therefore Average speed = 3/(47/240) km/hr
=15.32 km/hr
Hence, the correct answer is option (d) 15.32.