Vishnu travelled equal distances at speeds of 10 km/hr., 30 km/hr., and 8 km/hr., and took a total of 15.5 minutes to complete. Find the total distance he travelled, in km.

Show answer & explanation

Answer: (B) 3

Explanation

Let each part be d km. Time = d/10 + d/30 + d/8 hours = d(12 + 4 + 15)/120 = 31d/120 hours. This equals 15.5 minutes = 31/120 hour, so d = 1 km. Total distance = 3 × 1 = 3 km.