By walking at 3/4 of his usual speed, a man reaches his office 20 minutes later than usual. His usual time is :

A 30 minutes
B 75 minutes
C 45 minutes
D 60 minutes

Correct Answer: 60 minutes

প্রতিবার সে একই distance অতিক্রম করে, ধরি, usual speed = 1 একক এবং, usual সময় = x min দূরুত্ব = বেগ×সময় d = 3/4 (x + 20) = 1× x 3x + 60 = 4x x = 60
Bissoy MCQ
#গণিত #Oil & Gas Co. Ltd #Sylhet Gas Field Co - Asst. Manager -14.06.2013 #distance & speed) #দূরত্ব ও গতিবেগ (Time #সময়

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