A boy cycles a distance of 5 miles at a speed of 15 miles per hour and then cycles all the way back at a speed of 10 miles per hour. How long did the entire journey take him?

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  • 1 hour
  • 40 minutes
  • 50 minutes
  • 30 minutes
  • 45 minutes

5 = 15 * T1
5 = 10 * T2
T1 = 5 / 15
T2 = 5 / 10
1/3 + 1/2 = 5/6