Concept explainers
To find the total time to take when both machine work at opposite ends and works days and night to make 21 km surface on highway.
Answer to Problem 15P
The total time to take when both machine work at opposite ends and works days and night is
Explanation of Solution
Given New machine can make 1 km surface in 10 hr.
Old machine can make 1 km surface in 18 hr.
Work done of 1 km surface by New machine in one hour is
Work done of 21 km surface by new machine in
Similarly
Work done 1 km surface by old machine in one hour is
Work done of 21 km surface by old machine in
Express the equation of work done together for 21 km surface.
Multiply both the sides by 90, the LCM of 10 and 18
Apply distribute property
Hence, The total time to take is
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