SOLUTION: In a game of 6 players lasting for 40 mins there are 4 reserves. They substitute each player so that all players including reserves are on the pitch for the same length of time.
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Question 373952: In a game of 6 players lasting for 40 mins there are 4 reserves. They substitute each player so that all players including reserves are on the pitch for the same length of time.
How long is each player on the pitch ?