A car travels with a speed of 21 m sec in the first 10 minutes 9 0 km in the next 10 minutes and 10 ...........

Quantitative Aptitude (CPO) Time & distance

A car travels with a speed of 21 m/sec in the first 10 minutes, 9.0 km in the next 10 minutes and 10 km in the last 10 minutes of

its journey. What is the average speed of the car in km/h during its entire journey?

This questions was previously asked in

SSC CPO 10th Nov 2022 Shift 1

60.0 km/h

63.2 km/h

62.0 km/h

65.3 km/h

- First 10 minutes: Speed is 21 m/s. Convert to km/min: \( 21 \times 0.06 = 1.26 \) km/min. In 10 mins: \( 1.26 \times 10 = 12.6 \) km.

- Second 10 minutes: Car travels 9.0 km.

- Third 10 minutes: Car travels 10 km.

- Total Distance: \( 12.6 + 9 + 10 = 31.6 \) km.

- Total Time: 30 minutes or 0.5 hours.

- Average Speed: \( \frac{31.6}{0.5} = 63.2 \) km/h

- 1. Option 1: 60.0 km/h – Incorrect.

- 2. Option 2: 63.2 km/h – Correct.

- 3. Option 3: 62.0 km/h – Incorrect.

- 4. Option 4: 65.3 km/h – Incorrect.

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