A truck travels a distance of 240 km in 6 hours, partly at a speed of 60 km/ hr and partly at 30 km/ hr. Find the time for which it travels at 60 km/ hr.
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Let the truck travels for ?t? hour at 60 km/hr. ∴60×t+30×(6−t)=240 ⇒60t+180−30t=240 ⇒30t=60 ⇒t=2hr. ∴ Truck travels 2 hours at 60 km/hr.
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