Question

if factory a turns out 4 cars an hour and factory b turns out 20 cars every 2 hours the number of cars which both factoried turns out in 18 hours is

Answer 1

Factory A turns 64 cars in 18 hours.
Factory B turns 180 cars in 18 hours.
In 1 hour 4 cars then,
18×4=64
In 2 hours 20 cars then in 1 hour 10 cars,then,
18×10=180