I would go with D, but tell me if I'm wrong or not
good luck xx
a=-.25+6.7t, s=.75+4.5t when Amir catches up a=s so:
-.25+6.7t=.75+4.5t (add .25 to both sides)
6.7t=1+4.5t (subtract 4.5t from both sides)
2.2t=1 (divide both sides by 2.2)
t=10/22 hr
t≈0.45 hr (to nearest hundredth)
the answer is 0.45
