Hemant and Ajay start a two-length swimming race at the same moment but from opposite ends of the pool. They swim in lane and at uniform speeds, but Hemant is faster than Ajay. They first pass at a point $18.5 \mathrm{m}$ from the deep end and having completed one. Length, each one is allowed to rest on the edge for exactly $45 \mathrm{seconds}$. After setting off on the return length, the swimmers pass for the second time just $10.5 \mathrm{m}$ from the shallow end. How long is the pool?

Rahim sets out to cross a forest. On the first day, he completes $1/10\mathrm{th}$ of the journey. On the second day, he covers $2/3\mathrm{rd}$ of the distance traveled the first day.

He continues in this manner, alternating the days in which he travels 1/10th of the distance still to be covered, with days on which he travels $2/3$ of the total distance already covered. At the end of the seventh day, he finds that $227$km more will see the end of his journey. How wide is the forest?

The metro service has a train going from Mumbai to Pune and Pune to Mumbai every hour, the first one at $6 \mathrm{a}.\mathrm{m}.$ The trip from one city to another takes $4 \mathrm{hours}$, and all trains travel at the same speed. How many trains will you pass while going from Mumbai to Pune if you start at $12$ noon?