A person travels a certain distance at 3 km / hr and reaches 15 min late. If he travels at 4 km / hr, he reaches 15 min earlier . The distance he has to travel is __

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The sum of the digits of two -digit number is 10, while when the digits are reversed , the number decrease by 54. Find the changed number .

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If Tk. 5,000 is invested at 12% annual rate of interest, how much will the investment be worth after 2 years?

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A shopkeeper earns a profit of 12% on selling a book at 10% discount on the printed price. The ratio of the cost price and the printed price of the book is -

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The selling price of an article after giving two successive discounts of 10% and 5% on the marked price is TK. 171 . What is the marked price ?

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If A and B together can complete a work in 18 days, A and C together in 12 day and B and C together in 9 days, then B alone can do the work in -

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