2014 · Q2
A train takes 10 seconds to cross a pole and 20 seconds to cross a platform of length 200 m. What is the length of the train?
Elementary MathematicsTime, Speed and Distance
- A50 m
- B100 m
- C150 m
- D200 m
Explanation
Speed v = L/10. Crossing the platform: (L + 200)/v = 20, so L + 200 = 20·(L/10) = 2L, giving L = 200 m.