Walking at 7/8 of his usual speed a man late his office 15 min, find his ususual time.
Solution(By Examveda Team)
Speed becomes 7/8 of Usual Speed, it means Time become 8/7 of Usual time taken. [As Speed is inversely proportional to time taken when distance is constant. ST = D]
So,
8/7 of Usual Time = Usual Time + 15 min
Or, 8/7 of Usual Time - Usual Time = 15 min.
Or, 1/7 of Usual Time = 15 min.
So, Usual Time = 15*7
Or, Usual Time = 105 min = 1 hour, 45 min.
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How to find usual speed ?