Multiple choice

Hemant drives a car at the speed of 16 km/h, but stops for 8 minutes to take rest at the end of every 23 km. The time that he will take to cover a distance of 128 km is

  1. 8 h 40 min

  2. 9 h 20 min

  3. 6 h 40 min

  4. 8 h

  5. None of these
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A Correct answer
Explanation

Total distance = 128 km. Speed = 16 km/h. Driving time = 128 / 16 = 8 hours. He stops every 23 km. Number of stops = floor(128/23) = 5 stops. Total rest time = 5 * 8 minutes = 40 minutes. Total time = 8 hours 40 minutes.

AI explanation

Using the formula Time = Distance / Speed, the driving time to cover 128 km at 16 km/h is 128 / 16 = 8 hours. For the rest stops, we find he stops 5 times at the end of 23 km, 46 km, 69 km, 92 km, and 115 km (the journey ends at 128 km so no stop is needed there). The total resting time is 5 times 8 minutes, which equals 40 minutes. Adding this to the driving time gives a total time of 8 hours and 40 minutes.

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