One student takes 20 mins to reach school if he goes at a speed of 15kmph .At what speed should he go to reach in 15 mins ?

One Answer on this Question

1. 1) time =20mins,speed=15kmph=15*(5/18)=25/6 m/sec
   distance=20*(25/6)=250/3 m
   then 2) given as time =15min
   speed=250/3*15=(50/9)*(18/5)kmph=20kmph

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