A car takes 4 hours 30 minutes to cover a distance at a speed of 60km/h and three hours 20 minutes to come back. Find the average speed.
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Answer:
s = 68.97 km/hr
Explanation:
t1 = 4 hr 30 min = 4.5 hr
d1 = 60 * 4.5 = 270 km
t2 = 3hr 20 min = 3.33 hr
d2 = 270 km as it comes back
hence average speed is
s = (d1+ d2) / ( t1 +t2 )
= (270+ 270 ) / ( 4.5 + 3.33 )
= 68.97 km /hr
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