A train takes 1 s to cross a pole and 3 s to cross a platform 300 m long. Find the length of the train.

Find the speed of the bike in m/sec which covers a distance of $4\times {10}^4$ m in ${10}^{-2}$ seconds.

Two trains 152.5 m and 157.5m long, running in opposite directions, cross each other in 9.3 seconds. What will be the combined speed of both trains per hour?

An object travels $20$ meters in $4$ seconds and $15$ meters in the next two seconds. What is the average speed of the object?

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.