2
Q:
A) 2 hrs 50 min | B) 3 hrs 25 min |
C) 3 hrs | D) 2 hrs 5 min |
Answer: C) 3 hrs
Explanation:
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.