Bob bikes to school every day at a steady rate of x miles per hour. on a particular day, bob had a flat tire exactly halfway to school. he immediately started walking to school at a steady pace of y miles per hour. he arrived at school exactly t hours after leaving his home. how many miles is it from the school to bob's home?
a) (x + y) / t
b) 2(x + t) / xy
c) 2xyt / (x + y)
d) 2(x + y + t) / xy
e) x(y + t) + y(x + t)

Step-by-step explanation:We start with the total time t and we define it like this

being the time he was on x speed and the time he was on y speed

Now for the distance we have the velocity equation and in this excercise we would have the two equations

then

Next

this we simplify to get

4

Step-by-step explanation:

The overlap of the blue circle C and the orange circle D contains 2 numbers. Their total is the number of customers in the intersection of the two sets:

3 + 1 = 4