We know that speed=distance/time solve for time time=distance/speed
in this problem <span>Marco runs at a rate of 6 miles per hour. </span><span>Fernando funs at a rate of 7.2 miles per hour Difference=7.2-6=1.2 miles/hour so speed=1.2 miles/hour distance=0.3 miles time=? </span>time=distance/speed-----> 0.3/1.2-----> 0.25 hour-----> 0.25*60=15 minutes <span> the answer is 0.25 hour (15 minutes)
Alternative Method Let x---------> Fernando's distance when Marco is 0.3 miles apart
</span>Fernando funs at a rate of 7.2 miles per hour <span>for distance =x time=x/7.2------> equation 1
</span>Marco runs at a rate of 6 miles per hour. for distance=x-0.30 time=(x-0.30)/6------> equation 2
equate equation 1 and equation 2 7.2*(x-0.3)=6x-----> 7.2x-2.16=6x 7.2x-6x=2.16------> x=2.16/1.2-------> x=1.8 miles
