SOLUTION: If a student had walked 1km/hr faster, he would have taken 15 minutes less to walk 3 km. Find the rate at which he was walking.
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-> SOLUTION: If a student had walked 1km/hr faster, he would have taken 15 minutes less to walk 3 km. Find the rate at which he was walking.
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15 minutes = .25 hr
d = rt
3 = (r+1)(t-.25)
2 variables, one equation, cannot be solved explicitly, but intuitively we can try values:
r=3, t=1
3km/h
