Gurmit has to reach his friend's house, which is 36 km away from his house, in 45 mins. Should he travel by the city bus, which has an average speed of 30 km/h, or the train, which has an average speed of 50 km/h?
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Time taken to cover 20 km at speed 5 km/hr = 4 hours
∴ Fixed time = 4 hour - 40 minutes = 3 hour 20 min
Time taken to cover 20 km at the speed 8 km/hr = 20/8 = 2 hours 30 minutes
∴ Required time = 3 hours 20 minutes - 2 hr 30 min
=50 minutes
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