Quantitative Aptitude • Time, Speed & WorkHard
Two trains, each 120 m long, are running on parallel tracks in opposite directions at 36 km/h and 18 km/h. How long will they take to cross each other completely?
A. 4.44 seconds
B. 48 seconds
C. 8 seconds
D. 16 seconds✓ Correct Answer
💡 Solution & Explanation
In opposite directions, the speeds add: 36 + 18 = 54 km/h = 54 × 5/18 = 15 m/s. To cross completely, they cover both lengths: 120 + 120 = 240 m. Time = 240 ÷ 15 = 16 seconds. In the same direction the speeds would subtract instead.
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