Subject: General Aptitude · Chapter: Problems on Trains · Exam: 2007 · Marks: · Difficulty:
A train B speeding with 120 kmph crosses another train C running in the same direction, in 2 minutes. If the lengths of the trains B and C be 100 m and 200 m respectively, what is the speed (in kmph) of the train C?
(a)111 km
(b)123 km
(c)127 km
(d)129 km
Answer
Answer (as printed): D
Explanation
Relative speed of the trains $$=\left(\frac{100+200}{2 \times 60}\right) \mathrm{m} / \mathrm{sec}=\left(\frac{5}{2}\right) \mathrm{m} / \mathrm{sec} .$$
Explanation as extracted from the printed page; notation may be imperfect.