a car travels from place a to place b e speed 120 km per hour and returns speed 150 km per hour find the average speed of the car for whole journey
Answers
Answered by
1
Answer: Here, Distance covered by car while going and returning is equal.
∴ D_1 = D_2 = 100 km
=> Time for first leg T_1 : 60 km/ hr for 100 km is 100/60 = 1.67 hr
=> Time for second leg T_2 : 40 km/hr for 100 km is 100/40= 2.5 hr
=> Total time T = T_1 + T_2 = 1.67 + 2.5 hrs = 4.17
=> Total Distance D = D_1 + D_2 = 100 + 100 = 200 km
=> Average speed = D/T = 200/4.17= 47.96 km/hr ≃ 48 km/hr
Therefore, the average speed for the whole journey is approx 48 km / hr.
Step-by-step explanation:
Similar questions