Experienced 3318

An experienced tamer will wash an elephant in 40 minutes. It takes a temporary worker 2 hours. How long in a minute will a tamer and a temporary worker wash three elephants together?

Correct answer:

x =  90 min

Step-by-step explanation:

t1=40 min t2=2 h min=2 60  min=120 min  1/t1 x+1/t2 x=3 1/40 x+1/120 x=3  4x=360  x=4360=90  x=90=90 min

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