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I need help with number 002 and 003 (they go together)

Physics
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Oct 10th, 2014

(002) By using the equation, velocity = distance / time, we can find the time as follows:

          40 km/h = 149km / time

          Then by rearranging the equation,

          Time = 149 km / 40 km/h

                   =    3. 725 hours = 3.7 hours (rounded up)

(003) Now we should again calculate the time using the new velocity as follows:

          Time = 149 km / 59.9 km/h

                   = 2.5 hours

           To calculate how much time is saved, we have to substract the initial time with the new time;

            Therefore, Time saved = 3.7 h - 2.5 h

                                                  = 1.2 hours = 72 minutes.

Oct 10th, 2014

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