Home » Aptitude » Speed, Time and Distance » Question
  1. A car can finish a certain journey in 10 hours at the speed of 42 kmph. In order to cover the same distance in 7 hours, the speed of the car (km/h) must be increased by :
    1. 12
    2. 15
    3. 18
    4. 24
Correct Option: C

Distance covered by car = 42 × 10 = 420 km.
New time = 7 hours

∴  Required speed =
420
= 60 kmph.
7

∴  Required increase
= (60 – 42) kmph
= 18 kmph


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