An old man is walking on a foggy road at a speed of x km/hr. Due to low visibility, the old man see only up to 600 meters. If a car overtakes the man from the behind with the speed of 15 km/hr then the man can see the car for 216 seconds. Find the speed of the man?

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IBPS PO Prelims 23 Sept 2023 Memory Based Paper (Shift 1)
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  1. 2 km/hr
  2. 3 km/hr
  3. 4 km/hr
  4. 5 km/hr
  5. 6 km/hr

Answer (Detailed Solution Below)

Option 4 : 5 km/hr
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Distance up to old man see = 600/1000 = 0.6 km

Time for which the man can see the car = 216/(60 × 60) = 0.06 hour

ATQ, 0.6/(15 - x) = 0.06

⇒ 15 - x = 10

⇒ x = 5

Hence, the correct answer is 5 km/hr
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