Two outposts M and N are 320 km apart. Train A leaves M for N at 40 km/h at 6:00 AM. Train B leaves N for M at 60 km/h at 8:00 AM. At what time will they cross?
A person walks from his residence to his office at 4 km/h and arrives 15 minutes late. If he increases his speed to 6 km/h, he still arrives 5 minutes late. Find the distance.
Explanation:
Distance 1 = 50 * 3 = 150 km. Distance 2 = 60 * 2 = 120 km. Total distance = 270 km. Total time = 5 hours. Average speed = 270 / 5 = 54 km/h.
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