Use some thinking to answer the following question. How long does a lorry 200 m long traveling at 80 kmph takes to cross a bridge of 200 m in length?
Options:
(A) 15
(B) 17
(C) 15
(D) 16
(E) 18
D = 200 + 200 = 400 m
S = 80 * 5/18 = 200/9
T = 400 * 9/200 = 18 sec So the final answer is (E).