MBA Exam

Rishab"s mother starts from home,every day,drives to his school and reaches there exactly at 4:00 pm , and immediately picks him up from there and drives back home.One day, rishabh left school at 3pm and started walking home, without waiting for his mother.He met his mother on the way and together they reached home 40/3 minutes earlier than usual.If the next day,he left school at 3:30 pm , and started walking towards home ,how many minutes earlier than usual did they reach home?please please share the approach

1) 12
2) 8
3) 20/3
4) 19/3

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MBA Other Question
The circles are tangent to each other and circle is tangent to the side of the right triangle ABC with right angle ABC.if the larger circle has a radius 12 and smaller one has a radius 3, Then find the area of ABC..PLS share the approach

The numbers 2144 and 372 are converted into base 12 and written one beside the other. How many integers are there in the resulting number?

1) 74
2) 73
3) 71
4) 75