Homework Help: math

Posted by Julie on Thursday, October 23, 2008 at 1:35pm.

can someone please help me, Rob is going to college in Oklahoma which is 680 miles from their his home in Tennessee. He can travel on state highways at 55mph or on the interstate at 70mph. Approximately, how much longer will his trip be if he takes state highways?

A. 5 hrs 3 min
B. 4 hrs 13 min
C. 3 hrs 5 min
D. 2 hrs 39 min

math - bobpursley, Thursday, October 23, 2008 at 2:00pm
Have you considered using the equation

time=distanc/speed

figure the time for each, and subtract.
math - john, Thursday, October 23, 2008 at 4:06pm
C
- math - Ms. Sue, Thursday, October 23, 2008 at 4:33pm
  Yes. 3 hours, 5 minutes is correct.

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