A train of length 150m takes 40.5 seconds to cross a tunnel of length 300m. The speed of the train (in km/hr) is
Total distance travelled by train = 150m+300m = 450 metres
Total time = 40.5 sec
Speed of train = $$\frac{450}{40.5}$$ m/sec
           = $$\frac{100}{9}$$ m/sec
Speed of train in km/hr =Â $$\frac{100}{9}\times\frac{18}{5}$$
                  = 40 km/hr
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