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Question
Pierre and Billy started on a 48-km cycling trip at the same time. They cycled at the same speed for first 10 km. For the remaining 38 km, Pierre cycled faster than Billy. He arrived at the finishing point 40 minutes before Billy who was 10 km behind him. Billy did not change his speed throughout and completed it at 08 25.
  1. At what time did the trip begin? Give the answer in 12-hour format.
  2. What was Pierre's average speed for the remaining 38 km of the trip in km/h?
4 m
(a)

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(b)

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Pierre and Billy started on a 48-km cycling trip at the same time. They cycled at the same speed for first 10 km. For the remaining 38 km, Pierre cycled faster than Billy. He arrived at the finishing point 40 minutes before Billy who was 10 km behind him. Billy did not change his speed throughout and completed it at 08 25.
  1. At what time did the trip begin? Give the answer in 12-hour format.
  2. What was Pierre's average speed for the remaining 38 km of the trip in km/h?