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A game of football with 11 players lasts for exactly 90 minutes.

There are also four substitutes that alternate equally.

Therefore each player plays for the same length of time, how long?

 [Ref: ZXJI]

66 minutes.

At any one time there are 11 players on the field. So for the 90 minutes we have 11 players = 90 x 11 = 990.

These 990 player/minutes are divided by the 11 players, plus the 4 substitutes. Giving 990 ÷ 15 = 66.

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