Multiple choice

A motor car starts with the speed of 70 km/hr with its speed increasing every two hours by 10 kmph. In how many hours will it cover 345 kms?

  1. 4 hours

  2. 4 hours 5 minutes

  3. 4 hours 30 minutes

  4. 2 hours

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

Speed starts at 70 km/h and increases by 10 km/h every 2 hours: 70 km/h for first 2 hrs (140 km), 80 km/h for next 2 hrs (160 km), 90 km/h for remaining distance. After 4 hrs, distance = 300 km, remaining = 45 km. At 90 km/h, 45 km takes 0.5 hrs (30 min). Total = 4 hrs 30 min.

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