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Find the speed that he used to travel from Singapore to Malacca.
Speed = 243km / 4hrs = 60.75 km/hr

The speed for return journey,
60.75 + 15 = 75.75 km/hr

Time that he take for return,
243km / 75.75km/hr = 3.208 hrs

3.208 hrs = 3hrs 12 mins

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