Question

An elephant can do a work as fast as two horses ‘A’

Q: An elephant can do a work as fast as two horses ‘A’ and ‘B’ can do it by working together. I

Letthetotalwork114unitsEfficiencyofhorsewhocancompletetheworkin38hours114383unitshourEfficiencyofhorsewhocancompletetheworkin57hours114572unitshourThereforetimetakenbybothhorsestocompletetheworktogether11432228hoursThereforetimetakenbytheelephanttocompletethework228hours

and ‘B’ can do it by working together. If horse ‘A’ alone can complete the work in 38 hours and horse ‘B’ in 57 hours, then find the time taken by elephant to complete the work.

A 22.8 hours

B 21.8 hours

C 20.8 hours

D 25.8 hours

E None of these

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