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Australian AMC 2016 - Intermediate Question 23

AMC AUSTRALIA · Australian AMC 2016 - Intermediate

Question 23

Cynthia’s afternoon train normally arrives at her station at 5:30 pm each day, where she is picked up by Alan and driven home.

One day she was on an earlier train which arrived at 5 pm, and she decided to walk in the direction Alan was coming from home. Alan had left in time to meet the 5:30 pm train, but this time he picked up Cynthia and they arrived home 10 minutes earlier than usual.

For how many minutes had Cynthia walked before Alan picked her up?
  1. 20
  2. 30
  3. 25
  4. 10
  5. 15