Multiple choice

A car covers 30 km at a uniform speed of 60 km/hr and the next 30 km at a uniform speed of 40 km/hr. The total time taken is: [NTSE - Stage - 1, 2017-18, Madhya Pradesh]

  1. 30 min

  2. 45 min

  3. 75 min

  4. 120 min
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C Correct answer
Explanation

Time 1 = 30/60 = 0.5 hours = 30 min. Time 2 = 30/40 = 0.75 hours = 45 min. Total time = 30 + 45 = 75 min.

AI explanation

Using the Time, Speed and Distance formula, time equals distance divided by speed. The time for the first part is 30 km divided by 60 km/hr, which is 0.5 hours, and the time for the second part is 30 km divided by 40 km/hr, which is 0.75 hours. The total time taken is 1.25 hours, and converting this to minutes by multiplying by 60 gives 75 minutes. The total time taken is 75 min.

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