Michael visited his grandparents the total distance was 280 miles by train he could travel 90 miles per hour by bus he could travel 60 miles per hour how much time could michael save by taking the train

step-by-step explanation:

1

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c