Question

One fast typist type some matter in 2hr and another slow typist type the same matter in 3hr. If both do combine in how much time they will finish.

Answer 1

Answer:

1.2 hours

Step-by-step explanation:

Let fast typist be A and slow typist be B.

In 1 hour, A types 1/2 of the matter.

Similarly, in 1 hour, B types 1/3 of the matter.

Hence, together they type (1/2 + 1/3) = 5/6 of the matter in 1 hour.

In 1 hour they type 5/6 of the matter.

Hence, they'll type the entire matter in 1/(5/6) = 6/5 hours = 1.2 Hours