Explanation

Net north = 10 − 6 = 4 km

East = 3 km

Distance from starting point = √(4² + 3²) = √25 = 5 km

Last verified on 10-11-2026

Explanation

• Speed = 12 km/h
• Time = 15 minutes = 15/60 = 1/4 hour

Formula:

Distance = Speed x Time 

= 12 x 1/4

$$= 12 times frac{1}{4}$$ =3 km

Last updated 06 Nov 2026 by NA

Explanation

Use the set formula: 

Students who study CS or Math = CS + Math - Both  

= 55 + 50 - 10  

= 95 students

Students who study neither = Total students - Students who study CS or Math  

= 100 - 95  

= 5 students

Last verified on 02-09-2026

Explanation

"My daughter's father" = Dayyan himself

So:

Father of my daughter's father = Father of Dayyan

His only brother is the father of my daughter's father means:

The gentleman's only brother = Father of Dayyan

So the gentleman is the brother of Dayyan's father.

Gentleman is Uncle of Dayyan.

Last verified on 20-10-2026

Explanation

Let youngest brother = x

Sarah = 2x

Difference = 2x - x = 15

x = 15 years

So brother is 15, Sarah is 30.

Last verified on 20-10-2026