Question

An elephant can do a work as fast as two horses lsquo;Arsquo; and lsquo;Brsquo; can do it by working together. If horse lsquo;Arsquo; alone can complete the work in 30 hours and horse lsquo;Brsquo; in 45 hours, then find the time taken by elephant to complete the work.

A 12 hours
B 10 hours
C 18 hours
D 24 hours
E None of these
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