Subject: General Aptitude · Chapter: Problems on Trains · Exam: · Marks: · Difficulty:
What was the speed of the running train? (Bank P.O., 2000) I. Length of the train was 120 metres. II. The train crossed the other stationary train whose length was 180 m in 4 seconds. ONS)
Answer
SELF-PRACTICE — the source book printed no answer.
Nothing is invented here, so this question has no answer on record.
Explanation
Speed of the first train $$\begin{aligned} & =\frac{(\text { sum of the lengths of the two trains })}{\text { Time taken }} \\ & =\frac{(120+180)}{4} \mathrm{m} / \mathrm{s}=75 \mathrm{m} / \mathrm{s} . \end{aligned}$$ So, both the statements are necessary to get the answer. ∴ The correct answer is (e).