Subject: General Aptitude · Chapter: Time and Distance · Exam: · Marks: · Difficulty:
A train is scheduled to cover the distance between two stations 46 km apart in one hour. If it travels 25 km at a speed of 40 km/hr, find the speed for the remaining journey to complete it in the scheduled time.
(a)36 km/hr
(b)46 km/hr
(c)56 km/hr
(d)66 km/hr
Answer
Answer (as printed): C
Explanation
Time taken to travel $25 \mathrm{km}=\left(\frac{25}{40}\right) \mathrm{hr}=\frac{5}{8} \mathrm{hr}$. Remaining time $=\left(1-\frac{5}{8}\right) \mathrm{hr}=\frac{3}{8} \mathrm{hr}$. ∴ Required speed $=\left(21 \times \frac{8}{3}\right) \mathrm{km} / \mathrm{hr}=56 \mathrm{km} / \mathrm{hr}$.