Question

If the speed of a body is $5\frac{m}{s}$, then the time it would take to cover a distance of 6 km is:

• A. $\frac{1}{3}$ hour
• B. $\frac{2}{3}$ hour
• C. 1 hour
• D. $\frac{1}{5}$ hour

Answer 1

The correct option is A

$\frac{1}{3}$ hour

Given that speed = $5\frac{m}{s}$

In $\frac{km}{hr}$;

$5\times \frac{m}{s}$ = $x\times \frac{km}{hr}$

$5\times \frac{m}{s}$ = $x\times \frac{1000m}{60\times 60s}$

$5\times \frac{1m}{1s}\times \frac{3600}{1000}=x$

$5\times \frac{18}{5}=x$

$\therefore x=18\frac{km}{hr}$

Therefore, the time taken $=\frac{distance}{speed}=\frac{6}{18}hr=\frac{1}{3}hr$.