Naomi S. answered • 01/30/18

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Rate of Greta = x kph

Rate of Luis = x+10 kph

distance covered by Greta = d

distance covered by Luis = 43.5 -d

time = 45 minute = 45/60 =3/4 =0.75 hr

Speed = distance /time

Rate of Luis

x+10 = (43.5 -d ) / 0.75

0.75x+7.5= 43.5 -d

0.75x+d =36 _____________eq 1

Rate of Greta

x = d/0.75

0.75x =d _________________eq 2

substitute d=45x in equation 1

0.75x+d =36

0.75x +0.75x =36

1.5x =36

x =24

Rate of Greta = x kph=24 kph

Rate of Luis = x+10 kph=24+10 =34kph

Rate of Luis = x+10 kph=24+10 =34kph