
Andrew M. answered 08/02/17
Tutor
New to Wyzant
Mathematics - Algebra a Specialty / F.I.T. Grad - B.S. w/Honors
Initial speed = 420/7.5 = 56 km/hr
Speed desired = 420/5 = 84 km/hr
Speed increase: 84 - 56 = 28 km/hr faster