A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train in 54 km/hr, what is the length of the platform?

Ali travels a distance of $300 \mathrm{m}$ in $2$ minutes and $30$ seconds. What is his speed in $\mathrm{kmph}$?

Gopal covers $100 \mathrm{km}$. He travels at a speed of $60 \mathrm{kmph}$ for the first $40 \mathrm{km}$ and the rest of the distance at $40 \mathrm{kmph}$. What is his average speed in $kmph$?

1. $44.20$
2. $45.20$
3. $46.20$
4. $47.20$

Quantity$1$: Train A is running at a speed of $25 \mathrm{m}/\sec$ crosses. Train B is coming from opposite direction running at a speed of $15 \mathrm{m}/\sec$ in $12$ seconds. Length of Train A is twice of Train B. Find the length of train A.

Quantity $2$: $160$ Meters.

A man covers a certain distance in 10 minutes with the speed of 15km/hr. If he wants to cover the same distance in 7 minutes, then what should be his speed?