a ten-minute head start

[English Learner]

English Language Tests, Intermediate level

ESL/EFL Test #190 "Compound words: 'head'", question 6

First-time entrants in this year's city marathon will be given a ten-minute ......... over the rest of the field.

(a) headland
(b) head start
(c) head off
(d) headwind

English Language Tests, Intermediate level

ESL/EFL Test #190 "Compound words: 'head'", answer 6

First-time entrants in this year's city marathon will be given a ten-minute head start over the rest of the field.

Correct answer: (b) head start
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i dont no what compound word is

[Beeesneees]

compound = a thing consisting of two or more separate things combined together.
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Cheers m' dears!