K walked at 3 kmph for a certain distance with l and thereafter at 6 kmph with M to cover a total distance of 27 km in 7 hours. Find the distance travelled with M?

Show answer & explanation

Answer: (B) 12 km

Explanation

Let x km be walked with L at 3 km/h. Then x/3 + (27 − x)/6 = 7, so 2x + 27 − x = 42 and x = 15. Distance with M = 27 − 15 = 12 km.