Question 507490
d = r*t is the basic distance equation.
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t = 5 hr 30 min
t = 5.5 hr
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r = 60 km/hr
5.5 hr * 60 km/hr = 5.5*60 km
5.5*60 = 330 km
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r = 80 km/hr
5.5 hr * 80 km/hr = 5.5*80 km
5.5*80 = 440 km
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So your friend driving at 80 km/hr will be 110 km ahead.
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You also could have just done one solution using the speed difference.
80 km/hr = 60 km/hr = 20 km/hr
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5.5 hr * 20 km/hr = 110 km
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Done.