Subject: General Aptitude · Chapter: Problems on Trains · Exam: · Marks: · Difficulty:
What is the relative speed of two trains with respect to each other? (JMET, 2007) I. The speed of the first train is 120% more than the speed of the second train. II. The speed of the second train is 80 km/hr.
Answer
SELF-PRACTICE — the source book printed no answer.
Nothing is invented here, so this question has no answer on record.
Explanation
Speed of second train $=80 \mathrm{km} / \mathrm{hr}$. Speed of first train $=(80+120 \%$ of 80$) \mathrm{km} / \mathrm{hr}=176 \mathrm{km} /$ hr. I and II give us the speeds of both the trains but to find the relative speed, we need to know whether the trains are moving in same or opposite directions, which is not given. Thus, even both I and II together do not give the answer. ∴ The correct answer is (d).