Exams › SSC CGL (Prelims) › General

A taxi travels at a constant speed of 75 km/h to cover a certain distance in 3 hours 12 minutes. If road construction increases the time taken by 24 minutes, by what percentage must the taxi’s average speed decrease to complete the journey?

1. 10%
2. 11.11%
3. 12.5%
4. 13.33%

Correct answer: 11.11%

Solution

The original time is 3 h 12 min = 3.2 h, so the distance is \(75\times 3.2=240\) km. With 24 extra minutes, the new time is 3.6 h, so the new speed is \(240/3.6=66.67\) km/h. The decrease is \(75-66.67=8.33\) km/h, which is \(8.33/75\times 100=11.11\%\).

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