Multiple choice

With an usual speed of 40 km/hr a person reaches destination on time. But if he travels at a speed of 30 km/hr then he is late by 36 minutes. Find the distance he travelled ?

  1. 36 km

  2. 48 km

  3. 54 km

  4. 72 km

  5. 90 km
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let distance be D. Time1 = D/40, Time2 = D/30. Difference = 36 min = 36/60 hours = 0.6 hours. D/30 - D/40 = 0.6. (4D - 3D) / 120 = 0.6. D = 0.6 * 120 = 72 km.

AI explanation

Let the usual time taken be t hours. Using the formula Distance = Speed × Time, we have 40t = 30(t + 36/60), which simplifies to 40t = 30t + 18. Solving for t gives t = 1.8 hours, making the distance 40 × 1.8 = 72 km.

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