A train takes $3$ hours to reach a destination by travelling at a speed of $90 km/h$. How long will it take the train when it travels at the speed of $120 km/h$?

A swimming pool can be filled in $8 hours$ by $4$ equal pumps. How many such pumps are required if the pool is to be filled in $5\frac{1}{3} hours$?

If a sum of money is divided among $36$ persons, they will get $₹25$ each. How much money would each get if the number of persons are reduced by $6$?

At a camp there is sufficient food for $500$ scouts for $21$ days. If $250$ more scouts join the camp, how long would the food last?

If $x$ and $y$ vary inversely with each other, and $x=15$ when $y=6$, then find $y$ when $x=10$.

$15$ boys can finish a job in $8$ days. How many days will $6$ boys take to finish the same job?

If $28$ labourers can dig a place in $65$ days, how many labourers will it take to dig the same place in $35$ days?

A car is running at a constant speed of $80 \mathrm{km}/\mathrm{hr}$ and takes $23 \mathrm{hours}$ to reach the destination. If the car runs at a speed of $100 \mathrm{km}/\mathrm{hr}$, then how many hours will it take to reach the same destination? 

A boat is travelling at a speed of $57 km/hr$. How much distance will it travel in $120$ seconds.