Concept explainers
To determine how long would new sweeper take to do the job alone.
Answer to Problem 5P
Total time taken by new sweeper to do the job alone is 20 hrs.
Explanation of Solution
Given information :
Old sweeper alone does in 60h.
Old and new sweeper both do in 15h.
Let us assume that the total work be 60.
(assume total work as any multiple of the time given.)
Hence the work done by old sweeper in 1 hr is
Work done by both sweepers in 1 hr is
Hence work done by new sweeper in 1 hr is
Now time take by new sweeper to completer whole work is
Hence total time taken by new sweeper to do the job alone is 20 hrs.
Chapter 5 Solutions
Algebra and Trigonometry: Structure and Method, Book 2
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