Multiple choice

A car is moving with a speed of 54 km/hr. If it has to cross a track of length 90 m, how much time will it take?

  1. 5 seconds

  2. 6 seconds

  3. 7 seconds

  4. 8 seconds
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B Correct answer
Explanation

Speed = 54 km/h = 54 * (5/18) m/s = 15 m/s. Time = Distance / Speed = 90 / 15 = 6 seconds.

AI explanation

First, convert the car's speed from km/hr to m/s by multiplying by 5/18, which makes the speed 54 multiplied by 5/18, equaling 15 m/s. Using the formula time equals distance divided by speed, we divide the track length of 90 m by the speed of 15 m/s. The result is 6 seconds.

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