A taxi driver leaves Delhi at 8:30 a.m. and expects to reach Jalandhar, i.e. 300 km from Delhi, at 12:30 p.m. At 10:30, he finds that he has covered only 40% of the distance. By how much does he have to increase the speed of the car in order to reach Jalandhar on time?

At 10:30 a.m., the driver has travelled for 2 hours and covered 40 percent of 300 km, which is 120 km, meaning his initial speed was 60 km/hr. He has 180 km remaining and 2 hours left until 12:30 p.m., so his required new speed is 180 divided by 2, or 90 km/hr. The required increase in speed is 90 km/hr minus 60 km/hr, which equals 30 km/hr.

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