Answer : 3 3 hrs Explanation : Answer: C) 3 hrs Explanation: Let t be the usual time. If the usual rate is 1 unit, then the unusual rate is 6/7.Balance by the distance,1 x t = (6/7)(t 30)7t = 6(t 30)we get t as,t = 180 minutes = 3 hrs.

**Click here to see the full blog post**

**last edited by**