Question
Ankit reaches his office 8 minutes late if he travels at
80% of his usual speed. If distance of his office is 80 km, then find his usual time taken (in minutes) by him to reach office.Solution
Let the usual speed of Ankit be 'v' km/h and usual time taken to reach office be 't' hours.So, v X t = 0.8v X [t + (8/60) ]Or, 5t = 4 X [t + (2/15) ]Or, 5t = 4t + (8/15)Or, 't' = (8/15)Therefore, required time = (8/15) X 60 = 32 minutes
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