a motor car wishes to complete a 200 km journey in 4 hours. He takes 40
mutes to cover the first 15 km of his journey which lie in a city. At what constant speed should
be done the remaining distance on a highway to reach his destination in the desired
(Ans. 55.5 km/hr)
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Answer:
55.5 km/hr
Explanation:
Total distance = 200 km
Distance covered = 15 km
Therefore remaining distance = 185 km
Total time = 4 hours
Time spent in covering 15 km = 40 minutes = 40 / 60 = 2/3 hours
Remaining time = 4 - 2/3 = 10/3 hours
Therefore speed needed to cover remaining 185 km :
speed = distance/time
= 185 / (10/3) = (185 * 3) / 10 = 555/10 = 55.5 km/h
Hope u will get it friend!
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