SOLUTION: Superman takes off after Lex Luthor, who is 125 miles away. Flying to capture Lex takes superman 210 seconds with the tailwind. The return trip takes 215 seconds. How fast is Super

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Question 131955: Superman takes off after Lex Luthor, who is 125 miles away. Flying to capture Lex takes superman 210 seconds with the tailwind. The return trip takes 215 seconds. How fast is Superman? What is his speed? Convert to miles per hour to the nearest whole number.
Found 2 solutions by stanbon, checkley71:
Answer by stanbon(75887) About Me  (Show Source):
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Superman takes off after Lex Luthor, who is 125 miles away. Flying to capture Lex takes superman 210 seconds with the tailwind. The return trip takes 215 seconds. How fast is Superman? What is his speed? Convert to miles per hour to the nearest whole number.
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To Lex DATA:
Distance = 125 miles ; Time = 210/3600 hr. ; Rate = d/t= 125*3600/210 = 2142.86 mph
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From Lex DATA:
Distance = 125 miles ; Time = 215/3600 hr; Rate = d/t = 125*3600/215 = 2093.023
mph
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Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
125/210=.595238 MPS.
125/215=.5813953 MPS.
(.595238-.5813953)/2=.0138427/2=.00692 mps for the speed of the wind.
.00692*360=2.49 or 2.5 mph. for the wind.
.595238*360=214.28568 or 214 mph. with the wind.
.5813953*360=209.3 or 209 mph. against the wind.
214-2.5=211.5 mph. speed of Superman
209+2.5=211.5 mph. speed of Superman.