(A) 40 sec
(B) 42 sec
(C) 45 sec
(D) 48 sec
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(A) 40 sec
(B) 42 sec
(C) 45 sec
(D) 48 sec
Answer: Option (A) 40 sec
Explanation:
Formula for converting from km/hr to m/s: X km/hr = X x (5/18) m/s.
Therefore, Speed = 45 x (5/18) m/sec = 25/2 m/sec.
Total distance to be covered = (360 + 140) m = 500 m.
Formula for finding Time = Distance/Speed
Required time = (500 x 2)/25 sec = 40 sec.