Quantitative Aptitude • Time, Speed & WorkHard
Two trains, 110 m and 380 m long, are running on parallel tracks in opposite directions at 54 km/h and 72 km/h. How long will they take to cross each other completely?
A. 3.89 seconds
B. 3.14 seconds
C. 14 seconds✓ Correct Answer
D. 98 seconds
💡 Solution & Explanation
In opposite directions, the speeds add: 54 + 72 = 126 km/h = 126 × 5/18 = 35 m/s. To cross completely, they cover both lengths: 110 + 380 = 490 m. Time = 490 ÷ 35 = 14 seconds. In the same direction the speeds would subtract instead.
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