Questions 28, 29 and 30 are based on the following description.
There are three machines in a factory which make fertilizer upon orders. Each machine is capable of making any type of fertilizer, but no machine must be used to produce two or more types during one day. Capacity of each machine i.e. the amount of each type of fertilizer X, Y that each machine can produce in one hour is given below in Tonnes.

How long will it take to finish an order of 100 Tonnes of type X and 150 Tonnes of type Y, if only type X was made on machine B ?