Subject: General Aptitude · Chapter: Time and Distance · Exam: · Marks: · Difficulty:
A motorcyclist completes a certain journey in 5 hours. He covers one-third distance at 60 km/hr and the rest at 80 km/hr. The length of the journey is
(a)180 km
(b)240 km
(c)300 km
(d)360 km
Answer
Answer (as printed): D
Explanation
Let the length of the journey be $x \mathrm{km}$. Then, $\frac{\frac{1}{3} x}{60}+\frac{\frac{2}{3} x}{80}=5 \Rightarrow \frac{x}{180}+\frac{x}{120}=5 \Rightarrow \frac{5 x}{360}=5 \Rightarrow x=360$.