Washing cars

Frank takes 3 and 1/4 hours to wash six cars. How long will it take to wash 12 cars, 18 cars, and 24 cars?

Correct answer:

t1 =  6 13 = 19/3 h
t2 =  9 12 = 19/2 h
t3 =  12 23 = 38/3 h

Step-by-step explanation:

t6=361=3+61=63 6+1=618+1=6193.1667 h w=t6/6=619/6=6 619=36190.5278 h  t1=12 w=12 3619=3612 19=36228=319 h=631 h=6.3333 h
t2=18 w=18 3619=3618 19=36342=219 h=9.5 h
t3=24 w=24 3619=3624 19=36456=338 h=12.6667 h



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