A flight got delayed by $40$ minutes due to bad weather conditions. In order to reach its destination on time, which is $1600 \mathrm{km}$ away, the aeroplane had to increase the speed by 400 km/h of its original speed, which is $x \mathrm{km}/\mathrm{h}$.

The original speed of the plane is$?$

A flight got delayed by $40$ minutes due to bad weather conditions. In order to reach its destination on time, which is $1600 \mathrm{km}$ away, the aeroplane had to increase the speed by $400 \mathrm{km}/\mathrm{h}$ of its original speed, which is $x \mathrm{km}/\mathrm{h}$.

If the original speed of the plane is $750 \mathrm{km}/\mathrm{h}$, then find the time taken by the plane to cover a distance of $2250 \mathrm{km}$.

A flight got delayed by $40$ minutes due to bad weather conditions. In order to reach its destination on time, which is $1600 \mathrm{km}$ away, the aeroplane had to increase the speed by $400 \mathrm{km}/\mathrm{h}$ of its original speed, which is $x \mathrm{km}/\mathrm{h}$.

If the speed of the plane is decreased due to some technical reasons, then what will be the effect on the time taken if the distance remains the same?

A part of a roof with trapezoidal shape needs to be tiled with roof tiles. The bottom row needs $95$ roof tiles and every higher row needs one roof tiles less than the row below it until there are $76$ roof tiles needed for the top row.

The A.P. formed by the number of tiles (starting from the bottom row) in the rows is

A part of a roof with trapezoidal shape needs to be tiled with roof tiles. The bottom row needs $95$ roof tiles and every higher row needs one roof tiles less than the row below it until there are $76$ roof tiles needed for the top row.

The common difference of the A.P. is

A part of a roof with trapezoidal shape needs to be tiled with roof tiles. The bottom row needs $95$ roof tiles and every higher row needs one roof tiles less than the row below it until there are $76$ roof tiles needed for the top row.

The number of rows of the tiles are

A part of a roof with trapezoidal shape needs to be tiled with roof tiles. The bottom row needs $95$ roof tiles and every higher row needs one roof tiles less than the row below it until there are $76$ roof tiles needed for the top row.

The $n^{th}$nth term of the A.P. is

A part of a roof with trapezoidal shape needs to be tiled with roof tiles. The bottom row needs $95$ roof tiles and every higher row needs one roof tiles less than the row below it until there are $76$ roof tiles needed for the top row.

The number of rows of the tiles are

Shown below is the growth of a sapling. If you observe carefully it is growing in an A.P.Its height in the third week was $7 \mathrm{cm}$ and in the $7\mathrm{th}$ week it was $19 \mathrm{cm}$.

Based on the above information, answer the question by choosing the correct option from the given four option:

What is the growth of the sapling per week?