Question

ramesh could run a 100 m race in 20 s aftertraining he can finish the race in 15 s by how much was he improved his speed? write the answer in mixed fraction in m/s?
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Answer 1

Solution :-  

Given :

Distance = 100 m

Time = 20 sec  

Speed = distance / time          

           = 100/20 m/sec              

           = 5 m/sec  

After training,  

Distance = 100 m

Time = 15 sec  

Speed = distance / time        

           = 100/15 m/sec            

           = 6.67 m/sec (approx.)  

Speed improved = (6.67 - 5) m/sec                                                            = 1.67 m/sec  

Hence,

He improve his speed by 1 $\frac{67}{100}$ m/sec.