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A cistern is normally filled in 6 hours, but a leak makes it take 8 hours. How long would the leak alone take to empty a ful cistern?

A24 hours

B30 hours

C36 hours

D48 hours

উত্তর : A.

24 hours

শেয়ার :

সম্পর্কিত প্রশ্ন সমূহ

১.

What should be the ratio of sugar in a mixture costing BDT 50 per kg and BDT 55 per kg, such that there will be 10% profit if the mixture is sold for BDT 60 per kg?

ASat Dec 30 1899 10:11:00 GMT+0000 (Coordinated Universal Time)

BSat Dec 30 1899 10:01:00 GMT+0000 (Coordinated Universal Time)

CSat Dec 30 1899 01:10:00 GMT+0000 (Coordinated Universal Time)

DSat Dec 30 1899 06:05:00 GMT+0000 (Coordinated Universal Time)

২.

In trangle ABC, the external bisectors of the angles B and C intersect at point O. If angle A is 90 degrees, then the measure of the angle BOC is...

A90°

B75°

C90°

D45°

৩.

Find the value of $\:\left(\sqrt{3}+1\right)\left(10+\sqrt{1}2\right)\left(\sqrt{1}2\:-\:2\right)\left(55-\sqrt{3}\right)$ .

A224

B148

C124

D176

৪.

A circle is inscribed in a right triangle whose legs measure 9 and 12. Find the radius of the circle.

C3.5

৫.

In a geometric progression, the 3rd term is 12 and the 6th term is 96. Find the sum of the first 8 terms.

A510

B765

C1020

DNone

৬.

The present age of a father and his son are in ratio 7: 2. Five years ago the ratio was 6: 1. Find the sum of their present ages.

A45 years

B40 years

C35 years

D30 years

৭.

How many positive divisors of 7200 are perfect squares?

B10

C12

D15

৮.

For $x > 0$ , what is the minimum value of $x\:+\:\frac{16}{x}$ =?

C12

D16

৯.

Nasif's watch gains 4 minutes per hour. It was correct at 2:00 pm yesterday. When it displays 6:00 am today. What is the accurate time?

4 : 00 am

4 : 30 am

5 : 00 am

5 : 30 am

১০.

ab is negative and $a² + b²$ is greater than o, but less than 114. What is the minimum value of ab?

$-45$

$-48$

$-49$

$-56$