SOLUTION: A Car Travels For X Hours At Speed Of (x+2)km/h.if The Distance Travelled Is 15km.rite Do An Equation Of X

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Question 701024:
A Car Travels For X Hours At Speed Of (x+2)km/h.if The Distance Travelled Is 15km.rite Do An Equation Of X
Found 2 solutions by josmiceli, checkley79:
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+d+=+r%2At+
given:
+d+=+15+ km
+t+=+x+ hrs
+r+=+x+%2B+2+ km/hr
------------------
+15+=+%28+x+%2B+2+%29%2Ax+
+15+=+x%5E2+%2B+2x+
+x%5E2+%2B+2x+-+15+=+0+
+%28+x+%2B+5+%29%2A%28+x+-+3+%29+=+0+
+x+=+3+ ( ignore the negative answer )

Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
D=RT
15=(X+2)X
15=X^2+2X
X^2+2X-15=0
(X+5)(X-3)=0
X-3=0
X=3 HOURS.
R=3+2=5 KM PER HOUR.
PROOF:
15=3*5
15=15