Math CentralQuandaries & Queries


Question from Sabrina, a student:

A goods train of length one and half kilometres, is moving at a speed of 27km/hr. find the time taken by it to cross a tunnel of length seven and half kilometres



My diagram shows the train just as it starts over the tunnel and then just as it is finished crossing the tunnel. Notice that the end of the train has moved 1.5 + 7.5 = 9 km. At 27 km/hr how long does it take to go 9 km?


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