Explanation:
We know that: 1h = 60 minutes (Unitary method, considering quantities are linear)
Hence in 4h = 4*60 = 240 minutes, a car manufacturer produces 2400 cars.
We have to find,how many cars does the manufacturer produces in 15 minutes.
Hence we apply Unitary method:
In 240 minutes, a car manufacturer produces = 2400 cars
In 15 minutes, a car manufacturer produces:
(No. of cars in 4 h)*(Time taken)/Total time
Hence the car manufacturer produces 150 cars in 15 minutes.