Multiple choice

A Man travelled from A to B. He went to B at the speed of 30 km/h and came back at the speed of 12 km/h. If he took 9 hours and 20 min to complete his journey, what is the distance between A and B?

  1. 75km

  2. 80km

  3. 70km

  4. 90km

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

Let distance between A and B = d km. Time to go = d/30 hours. Time to return = d/12 hours. Total time = 9 hours 20 min = 28/3 hours. Equation: d/30 + d/12 = 28/3. Multiplying by 60: 2d + 5d = 560, so 7d = 560, giving d = 80 km.

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