Answers

2014-04-07T18:55:14+05:30
Speed = distance / time
          = 100/15
          = 6.6 m/s
          = 6.6 * (18/5)
          =23.76 km/hr
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2014-04-07T19:18:20+05:30
Average speed = total distance/total time taken
on puting the numerical value we can get the answer ..
v = 100/900 =1/9 m/s on multiplying it by 18/5 to convert it ti km/hr 
1/9x18/5 =0.4km/hr
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