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SSC CPO 2024 PYQ — Question 124

SSC CPO - 29 June 2024 - Shift 1 • Quantitative Aptitude • Q124

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In a 100-km journey, the average speed of S is 40 km/h. He covers the first 60 km in 40 minutes and the next 20 km in 50 minutes. What is his speed in the last 20 km (in km/h)?

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Correct answer: D

Explanation

The correct answer is option 4 i.e. 20.

Average speed = Total distance/Total time

Let the time taken in the last 20 km joiurney be t hours.

According to the given question,

40 = 100/{(40/60) + (50/60) + t}

⇒ 232 \over 3 + 565 \over 6 + t = 525\over 2

⇒ 969 \over 6 + t = 525\over 2

⇒ t = 1 hour

Speed in last 20 km journey = 20/1 = 20 km/h

Hence his speed in the last 20 km (in km/h) is 20.