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A train travels from City X to City Y in 3 hours and 30 minutes at an average speed of 60 miles per hour

Using Distance = Speed * Time we get
Distance from X to Y = 60 miles per hour * 3 hours and 30 minutes = 60 * 3.5 miles [ 30mins = 0.5 hours ]
=> Distance from X to Y = 210 Miles

If the train returns at an average speed of 50 miles per hour, how long does the return trip take?

Distance from Y to X = Distance from X to Y = 210 Miles
Speed = 50 miles per hour
Using, Time = \(\frac{Distance}{Speed} \), we get

Time = \(\frac{210 miles}{50 Miles Per Hour}\) = 4.2 hours
= 4 hours 0.2*60 mins = 4 hours 12 mins

So, answer will be C
Hope it helps!
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