Multiple choice

A taxi driver leaves delhi at 7:30 am and expects to reach a place 500 km from delhi at 7:30 pm. At 12:30 he finds that he has covered only 30% of the distance. By how much he has to increase the speed of the taxi to reach his destination on time ?

  1. 25

  2. 50

  3. 30

  4. 20

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Total time = 12 hours (7:30 am to 7:30 pm). Required speed = 500/12 = 41.67 km/h. By 12:30 pm (5 hours), only 30% (150 km) covered. Speed used = 150/5 = 30 km/h. Remaining 350 km in 7 hours needs speed = 350/7 = 50 km/h. Increase needed = 50 - 30 = 20 km/h, which is option D.