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The time taken and the distance that a car can travel are in direct proportion.  A car travelling at a constant speed for 3 hours can cover a distance of 270 km.  Find (a)  how far the car can travel in 2 hours, (b)  how long it would take for the car to travel 405 km, (c)   how far the car can travel in t hours, (d)   how long it would take for the car to travel d km.​