Question

If a car completes a trip in 20 minutes, travelling 100km per hour for the first half and 90km per hour for the second half and the distance covered in both halves are equal, how far did the car travel?

Answer 1

A/Q
Total Time=20/60 hr=1/3 hr.
Now,
Speed for First half=100kmph.

First Let the total Dist. = x
Then,
Time in First Half= x/200

Similarly,
Time in Second Half= x/180
Hence,

x/200+x/180 = 1/3
Therefore,

x= 31.5 km Ans.

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