A 675 m. long train is running at a speed of 60 km/hr. How much time does it take to cross a man running at 6 km/hr in the same direction? 675 मी. लम्बी एक रेलगाड़ी 60 किमी./घंटा की गति से चल रही है। यह एक आदमी जो 6 किमी./घंटा की गति से रेलगाड़ी के चलने की दिशा में दौड़ रहा है, को पार करने में कितना समय लेगी?
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40 second/सेकण्ड
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42 second/सेकण्ड
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45 second/सेकण्ड
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48 second/सेकण्ड
C
Correct answer
Explanation
When crossing in the same direction, subtract speeds: relative speed = 60 - 6 = 54 km/hr = 54 × 5/18 = 15 m/s. Time = distance/speed = 675/15 = 45 seconds. The train must cover its own length relative to the man. Key distractors: 42 seconds (uses 60 km/hr without subtracting man's speed), 48 seconds (incorrect unit conversion).