a car travel 100 km at a speed of 60km/h and return with a speed of 40km/h calculate the average speed of the car
Answers
Answer:
48 km/hr
Step-by-step explanation:
Distance one side = 100 km
Speed one side = 60 km/h
time taken one side = Distance/speed = 100/60 hr
= (100/60)*60 = 100 mins
Speed return = 40 km/h
time taken one side = Distance/speed = 100/40 hr
= (100/40)*60 = 150 mins
Total time take = 100 + 150 = 250 min
= 250/60 hr
= 25/6 hr
Total distance = 100 + 100 = 200 km
Average speed = 200/(25/6) = 48km/hr
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Answer:
simple! take the average of initial and final values of the speed.
Explanation:
initial speed Vi=60km/h
final speed Vf=40Km/h
then,
Average speed of the car Vav = Vi+Vf/2
Vav= 60+40/2
Vav=50 km/h
In S.I units Vav= 50*1000/3600 m/s
=13.88m/s