Multiple choice

A car travels from A to B at a constant speed. If its speed were increased by 10 km/hr it would have been taken an hour lesser to cover the distance. It would have taken further 45 minutes lesser if the speed was further increased by 10 km/hr. What is the distance between the two places? (in km)

  1. 300

  2. 360

  3. 600

  4. 420

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Using d=vt=(v+10)(t-1)=(v+20)(t-1.75), solving yields t=7 hours and v=60 km/h. The distance d=60×7=420 km matches option D. Check: at 60 km/h takes 7 hours, at 70 km/h takes 6 hours, at 80 km/h takes 5.25 hours (difference of 45 minutes).

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