#### To determine

**a)**

**To explain:**

Which car is ahead after one minute?

#### Answer

Car *A*

#### Explanation

The greater area covers greater distance.

From the graph, the curve of car A is more than the curve of car B after one minute.

Therefore, car A is ahead of car B.

**Conclusion:**

Car A is ahead of car B

#### To determine

**b)**

**To explain:**

The meaning of area of shaded region

#### Answer

The shaded region represents the difference in distances travelled by car A and car B.

#### Explanation

The shaded region represents the difference in distances travelled by car A and car B.

The distance travelled by car A is more than that travelled by car B

#### To determine

**c)**

**To explain:**

Which car is ahead after two minutes?

#### Answer

Car *A*

#### Explanation

Car B is travelling faster than car A after one minute, and therefore, car B will be faster than car A after *2* minute. But the area under the curve of car A is more than the area under the curve of car B.

So, car A is ahead of car B.

**Conclusion:**

Car A is ahead of car B.

#### To determine

**d)**

**To estimate:**

The time at which the cars are again side by side

#### Answer

*2.1 minute*

#### Explanation

Car *A* and car *B* will be side by side when the area under the curve *A* is the same as the area under the curve *B*.

From the graph, it appears that when *t≈2.1 minute*, they will have the same area.

**Conclusion:**

The time at which the cars are again side by side is *t≈2.1 minute*.