Answers

2015-02-14T21:21:56+05:30
22/*r*r=154
   r*r=49
  r=7
therefore, perimeter=2*22/7*7=44
the distance traveled by her=2*44=88=.088km
we know that- speed =distance/time;
5=.088/t
 then, t=0.88/5=0.176.hr.

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2015-02-14T21:27:57+05:30
area of circle =  \pi r^2

              154 =  \frac{22}{7} * r^2

               \sqrt{49} = r
            r = 7 m
circumference = 2 \pi r
                      = 2 * 2 * \frac{22}{7} * 7
                       = 88m
time = ditance / speed
        =  \frac{88}{5000} hr.
        =  \frac{11}{625} h
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