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Question 12
A train running at 18 km per hour crosses a mark on the platform in 9 seconds and takes 25 seconds to cross the platform. If P is the length of the train and Q is the length of the platform in meters, then (P, Q) = ___________ .
Solution
Speed of train = 18 km/hr = 5 m/s
Let the length of train be 'P'
It is given,
$$\frac{P}{5}=9$$
P = 45m
Let the length of platform be 'Q
It is given,
$$\frac{P+Q}{5}=25$$
P+Q = 125
Q = 125 - 45 = 80m
(P, Q) = (45, 80)
The answer is option A.
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