Problema Solution
Erica hiked up a mountain trail at 3 km/h and returned at 4 km/h. The entire trip took 280 minutes. How long was the trail?
Answer provided by our tutors
D=RT
D=3X UP THE MOUNTAIN
D=4(14/3-X)
3X=56/3-4X
3X+4X=56/3
7X=56/3
X=(56/3)/7
X=56/3*1/7
X=56/21
X=8/3
X=2 HOURS 40 MIN TO CLIMB UP THE MOUNTAIN.
D=3*8/3
D=8 MILES UP THE MOUNTAIN.
PROOF:
8=4(14/3-8/3)
8=4(6/3)
8=4*28=8