Question : A person covers a certain distance in 6 hours if he travels at 40 km/hr. If he has covered the same distance in 4 hours, then his speed must be:
Option 1: 50 km/hr
Option 2: 60 km/hr
Option 3: 80 km/hr
Option 4: 70 km/hr
Correct Answer: 60 km/hr
Solution :
The person covers a certain distance in 6 hours if he travels at 40 km/hr.
$\text{Speed}=\frac{\text{Distance}}{{\text{Time}}}$
Distance covered in 6 hours = 6 × 40 = 240 km
$\therefore$ To cover the same distance in 4 hours, then his speed must be $\frac{240}{4}$ = 60 km/hr
Hence, the correct answer is 60 km/hr.
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