Multiple choice

A car travels first $30 km$ with a uniform speed of $60 kmph$ and then next $30 km$ with a uniform speed of $40 kmph$. Calculate the total time of journey.

  1. $15\ min$
  2. $30\ min$
  3. $60\ min$
  4. $75\ min$
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D Correct answer
Explanation

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

AI explanation

The total time of the journey is the sum of the times for each segment, calculated using the formula time equals distance divided by speed. The time for the first 30 km is 30 divided by 60, which is 0.5 hours. The time for the next 30 km is 30 divided by 40, which is 0.75 hours, making the total time 1.25 hours; multiplying this by 60 minutes gives a total journey time of 75 minutes.

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