Work done by all the three members in 1 hour =`1/5+1/10+1/25` `=(10+5+2)/50 = 17/50` part of the work ∴ Time taken by them to complete the work = `50/17` hrs ∴ Time taken by the leader = `50/17` hrs = 3 hrs (approx.)
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( NOTE: Operations should be perf...
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