Question
A truck travels from depot ‘D’ to warehouse ‘W’.
If it moves at 80 km/h, it reaches 1 hour early. If it moves at 60 km/h, it reaches 1 hour late. What is the distance between depot ‘D’ and warehouse ‘W’?Solution
Let the distance between depot ‘D’ and warehouse ‘W’ be ‘d’ km Let the correct time to travel be ‘t’ hours According to the question, (d/60) = t + 1 And, (d/80) = t - 1 Or, (d/60) - (d/80) = 2 Or, (4d - 3d) ÷ 240 = 2 Or, d = 2 × 240 = 480 Therefore, distance between depot ‘D’ and warehouse ‘W’ is 480 km.
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