# CBSE Class 10-Mathematics: Chapter – 3 Pair of Linear Equation in Two Variables Part 16 (For CBSE, ICSE, IAS, NET, NRA 2022)

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**Question 7**:

A train covered a certain distance at a uniform speed. If the train would have been faster, it would have taken hours less than the scheduled time. And, if the train were slower by , it would have taken hours more than the scheduled time. Find the distance covered by the train.

**Answer**:

Let the speed of the train be x km/h and the time taken by train to travel the given distance be hours and the distance to travel be .

Since Speed

According to the question

Again,

Adding equations (2) and (3) , we obtain:

Substituting the value of x in equation (2) , we obtain:

From equation (1) , we obtain:

Thus, the distance covered by the train is .

**Question 8**:

Draw the graphs of the equations and Determine the co-ordinate of the vertices of the triangle formed by these lines and the axis

**Answer**:

Three solutions of this equation can be written in a table as follows:

3 |

It can be observed that the required triangle is .

The coordinates of its vertices are .