RRB NTPC · Question 42
Two cycles start from a house at interval of 10 minutes and travel with a speed of 6km/hr. With how much speed (km/hr) should a woman coming from the opposite direction towards the house travel, to meet the cycles at an interval of 8 minutes?
Show answer & explanation
Answer: (C) 1.5
Explanation
Cycles 10 minutes apart at 6 km/h are 6 × 10/60 = 1 km apart. Meeting them every 8 minutes means (6 + v) × 8/60 = 1, so 6 + v = 7.5 and v = 1.5 km/h.