Question 10

# Jai travels from his house to school at a speed of 10 km/hr and reaches late by 5 minutes.If he increases his speed by 3 km/hr,he will reach the school 4 minutes early. What is the distance between his house and the school?

Solution

Let the distance be x between Jai's house and his school.

According to question ,

$$\frac{x}{10} - \frac{x}{13} = \frac{9}{60}$$

$$\frac{3}{130} \times x = \frac{3}{20}$$

x= 6.5

So , the answer would be Option b)6.5 km.