If Machine A makes a yo-yo every five minutes and Machine B takes ten minutes to make a yo-yo, how many hours would it take them working together to make 20yo−yos?
2 answers:
If every 5 mins, A makes 1 yo-yo every 10 mins, B makes 1 yo-yo then every 10 mins, both machines produce 3 yo-yos every 10 mins (2 from machine A and 1 from machine B) Therefore, for 20 yo-yos, both machines would take 70 minutes( 1 hour and 10 mins). After 70 minutes, 21 yo-yos would be produced.
Explanation:
Since we have given that
Time taken by Machine A to make a yo- yo = 5 minutes
Work done by Machine A in 1 minute is given by
Time taken by Machine B to make a yo - yo = 10 minutes
Work done by Machine B in 1 minute is given by
Work done by both of them altogether is given by
Now, he can do,
We need to find the number of hours working together to make 20 yo-yos,
Hence,
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