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May 4th, 2018, 06:35 PM   #1
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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?
Ganesh Ujwal is offline  
 
May 4th, 2018, 07:30 PM   #2
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C'mon Ganesh...it's obvious that what is meant is:
"after exactly 30 minutes, Saha will be....."
Denis is online now  
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