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May 4th, 2018, 07:35 PM  #1 
Senior Member Joined: Aug 2014 From: India Posts: 343 Thanks: 1  Why time is taken as 30 mins?
Saha travelling at a speed of 84kmph is 6 km behind Nihal. After 30 mins, Saha will be 6 km ahead of Nihal. Find the speed of Nihal. Solution: speed x time = distance T = 30 min = 1/2 hour (84  X) 1/2 = 12 ( here X is Nihal speed) X = 60kmph. Why time is taken as 30 mins if they mention after 30 mins so it should be more than 30 min? 
May 4th, 2018, 08:30 PM  #2 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 13,791 Thanks: 970 
C'mon Ganesh...it's obvious that what is meant is: "after exactly 30 minutes, Saha will be....." 

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