There is a formula for this:
Time = (Worker1 Time * Worker2 Time) / (Worker1 Time + Worker2 Time)
Time = (12 * 8) / (12 + 8)
Time = 96 / 20
Time = 4.8 Hours
Source:http://www.1728.org/work.htm
I’d say the answer is B.
So, the way I’m gonna do this is to subtract 7 from 9 and then, add 3 and 4.
So, now you have (2 x 7)^2
And then, (14)^2
what are the answers in the menu?
The problem is modelled as right angle triangle, shown in the diagram below
The distance between the pilot and the house is labelled as
Using the trigonometry ratio of sine