Akhil rides first 12 km at a speed of 16 km/h and further 6 km at a speed of 20 km/h. Find his average speed (in km/h).
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 17
km/h.
Given:
For distance = 12 km, speed = 16 km/h
For distance = 6 km, speed =20 km/h
Concept Used:
Average Speed = Total distance/Time Taken
Explanation:
Time Taken = 12/16 + 6/20 = (60 + 24)/80 = 84/80 = 21/20
Average Speed = 18/(21/20) = (18 × 20)/21 = 120/7 = 17
Hence the average speed is 17 km/h.