Delhi Police SI 2024 June 27 Shift 2 Question Paper

Three boys, on an average, are $25$ years old, and their ages are in the ratio of $3:5:7$. What is the age of the youngest boy?

Arvind works $4$ times as fast as Suresh. If Suresh can complete a work in $20$ days independently, then find the number of days in which Arvind and Suresh can together finish the work.

A bus covers the first $50\text{km}$ of its journey in $40$ minutes and covers the remaining $75\text{km}$ in $40$ minutes. What is the average speed (in $\text{km/h}$) of the bus?

Simplify the following expression:
$$25\times 25+9\times 9+6\times 6+2\times 25\times 9+2\times 9\times 6+2\times 25\times 6$$

A man can row $7.5\text{km}$ an hour in still water. He finds that it takes four times as much time to row upstream as it takes to row downstream. The speed of the stream is: