Answers

2014-08-27T16:00:24+05:30
Distance=100m or 0.1km
time taken=15min or 15/60hr=1/4hr
speed=distance/time=0.1÷1/4=0.4km/h
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2014-08-28T17:58:14+05:30
D=100m
t=15 mins=15*60 sec
     
     speed= distance                   100
              ----------------       =        ------------- m/s
                  time                         15*60 
 

1m= 1/1000 km
1s= 1/60*60 hr
so, 1m/s = 1/1000  divided by 1/60*60 = 1/1000 * 60*60/1 = 18/5

thus,
          100              18             0.4 km/hr
         -------    *    ---------   =
          15*60*         5

2 5 2
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