Allen B. answered • 12/17/14

Experienced tutor of Algebra, Precalculus, Calculus and Physics

You are given D=distance, V=Speed(also called velocity), and you are asked for T=time.

The relationship among these 3 variables is:

D(mi) = V(mi/hr) * T(hr).

You have D and V, you need T. Using algebra to solve for T:

T = D/V D= 3/4 mi = 0.75 mi V= 1 1/8 mi/hr = 1.125 mi/hr,

Therefore: D = 0.75/1.125 = 0.6667 hr = 2/3 hr or 40 min.

You can also use just the fractions: D= 3/4, V= 1 1/8 = 9/8, then

T= (3/4) / (9/8) = (3/4)*(8/9) = 2/3 hr or 40 min