Julian rides his bike uphill for 45 minutes, then turns around and rides back downhill. it takes him 15 minutes to get back to where he started. his uphill speed is 3 miles per hour slower than his downhill speed. find julian’s uphill and downhill speed.

1.5mi/hr, 4.5mi/hr

Explanation:

Given:

45 min = 0.75h, 15 min = 0.25h

(1) 0.75v₁ = 0.25v₂

(2) v₁ = v₂ - 3

Solve for v₁ and v₂:

0.75(v₂ - 3) = 0.25v₂ = 0.75v₂ - 2.25 = 0.25v₂

0.5v₂ = 2.25

v₂ = 4.5

v₁ = 1.5

i think it would be 80 km/h because 30 + 50 = 80 (sorry if this not the right answer i'm trying my best)

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