Question
A girl walking at a speed of 9 km/h crosses a bridge in
45 minutes. Find the length of the bridge in metres..Solution
Time = 45 minutes = 45/60 hours = 0.75 hours Speed = 9 km/h Distance = Speed × Time ⇒ Distance = 9 km/h × 0.75 hours ⇒ Distance = 6.75 km ⇒ Distance in metres = 6.75 km × 1000 ⇒ Distance = 6750 metres
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