Question 279596
Pablo can drive 5 times as fast as Oscar can ride his bicycle. If it takes Oscar 4 hours longer than Pablo to travel 90 miles, how fast can Oscar ride his bicycle?

Let Oscar's speed be x

Pablo's speed = 5x

t= distance /rate

90/x = oscars tiem

PAblo's time = 90/5x

90/x  + 4 = 90/5x

90/x-90/5x=4
450-90 /5x= 4

360 -90=20x

270 =20x

x= 13.5 mph