Sumita takes 1 hour 24 minutes to reach home from work by bus. If she takes a taxi, she could reach home in a quarter of the time taken by the bus. How much longer is her travelling time by bus?

Answer: A. 63 minutes

First, convert the bus time to total minutes: 1 hour 24 minutes is 84 minutes.
A quarter of that time for the taxi is 21 minutes ( 84/4 =21).
The difference between the two travel times is 63 minutes ( 84 -21).
Therefore, her traveling time by bus is 63 minutes longer.

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