Question

Meenakshi cycles to her school at an average speed of 12 km/hr and takes 20 minutes to reach her school. If she wants to reach her school in 12 minutes, her average speed should be:

• A. $\frac{20}{3}$ km/hr
• B. 16 km/hr
• C. 20 km/hr
• D. 15 km/hr

Answer 1

The correct option is C

20 km/hr

As speed increases, the time decreases and hence this is a case of inverse variation.

$⟹\frac{12}{x}$ = $\frac{12}{20}$

Hence, $x$ = 20 km/hr

$\therefore$ The average speed should increase to 20 km/hr.