In a 1200 m race Usha beats Shiny by 50 m. In the same race, by what time margin Shiny beat Mercy who runs at 4 m/s ? Choose the correct option.
A) 100 sec.  B) 50 sec  C) 60 sec  D) Data not sufficient  E) None of these
Speed of Shiny = 50/ 10= 
<gadget id="calculator">50/ 10</gadget>
<output>5</output>
5m/s   Time taken by shiny to complete the race is B= 1200/5= 
<gadget id="calculator">1200/5</gadget>
<output>240</output>
240 sec.   Time taken by Baley to complete the race is D= 1200/4= 
<gadget id="calculator">1200/4</gadget>
<output>300</output>
300 sec.   Hence, D-B= 60 sec   ANSWER:60 sec
<result>C</result>
In a 1200 m race Usha beats Shiny by 50 m. In the same race, by what time margin Shiny beat Mercy who runs at 4 m/s ?