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Elena-2011 [213]
4 years ago
15

If an experienced surveyor can survey a roadbed in 7 hours and an apprentice surveyor needs 10 hours, how long will it take them

to complete the job together
Mathematics
1 answer:
natulia [17]4 years ago
7 0
Experienced: I hour, 1/7 done
apprentice: 1 hour, 1/10 done

together: 1 hour, 10/70 + 7/70 = 17/70 done
Therefore...
1 / 17/70 = 4.1176 hours (70/17 hours)
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