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Step by step explanation
Rahul 2/7=6
Rahul 2/7=6whole work in 21
Rahul 2/7=6whole work in 21Suresh 3/5=9
Rahul 2/7=6whole work in 21Suresh 3/5=9whole work in 15
Rahul 2/7=6whole work in 21Suresh 3/5=9whole work in 15work together=1/15+1/21=12/105
Rahul 2/7=6whole work in 21Suresh 3/5=9whole work in 15work together=1/15+1/21=12/105together 7 days=7*12/105=12/15
Rahul 2/7=6whole work in 21Suresh 3/5=9whole work in 15work together=1/15+1/21=12/105together 7 days=7*12/105=12/15work done by 4/5
Rahul 2/7=6whole work in 21Suresh 3/5=9whole work in 15work together=1/15+1/21=12/105together 7 days=7*12/105=12/15work done by 4/5remaining work 1-4/5=1/5
Rahul 2/7=6whole work in 21Suresh 3/5=9whole work in 15work together=1/15+1/21=12/105together 7 days=7*12/105=12/15work done by 4/5remaining work 1-4/5=1/5Suresh done 1/5 work in 1/5*15= 3days
Hope this helps u !!!