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Question
If a person travels at a speed of 40 km/h he will reach his destination on time. He covered half the journey in `2/3` of the time. At what speed (in km/h) should he travel to cover the remaining journey to reach the destination on time?
Options
48
50
60
72
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Solution
60
Explanation:
Let the person reaches his destination in t hours.
then, Half of the distance he has to cover
`=(40xx"t")/2` = 20. t kg.
Remaining time`="t"-2/3"t"="t"/3`hours.
required speed`=(20."t")/(("t"/3))`= 60 km/h
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