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).
Answer & explanation
Correct answer: option 2
Distance = speed × time
Time 1 = \(\frac{12}{16}\)
Time 2 = \(\frac{6}{20}\)
Total time = \(\frac{12}{16}\) + \(\frac{6}{20}\)
= \(\frac{84}{80}\) km/h
Total Distance = 12 + 6 = 18 km
Average Speed = \(\frac{18 × 80}{84}\)
= 17\(\frac{1}{7}\) km/h