Question

One plane travels at $600$ miles per hour and the other at $720$ miles per hour. Find the difference between the distance covered in $12$ seconds by the two planes.

• A. $\frac{1}{30}$
• B. $\frac{2}{5}$
• C. $2$
• D. $30$

Answer 1

The correct option is B $\frac{2}{5}$

One plane travels at $600$ miles per hour and other plane at $720$ miles per hour

Then first plane travel in $12$ seconds $=$ $\frac{600\times 12}{3600}=2$

Then second plane travel in $12$ seconds $=$ $\frac{720\times 12}{3600}=\frac{12}{5}$

Difference between distance covered in $12$ seconds $=$ $\frac{12}{5}-2=\frac{12-10}{5}=\frac{2}{5}$