A train 110m long passesa man, running at 6 kmph in the direction opposite to that ofthe train ,in 6 seconds.What is the speed of the train?

Let train speed be X km/hThen relative speed will be (X-6)convert relative speed into (X-6)×5/18 m/secrequired time = length of the train/ relative speed6= 110×18/(X-6)×5X= 72 m/sec