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Question
A car takes 6 hours to reach a destination by travelling at a speed of 50 km per hour. How long will it take when the car travels at a speed of 75 km per hour?
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Solution
Time: Distance:: Time: Distance
6 : 50 km :: x : 75
∴ By inverse proportion
6 × 50 = x × 75
`⇒"x"=(50xx6)/75`
= 4 hours
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