Moving 6/7 of its usual speed a train is 10 min late. Find its usual time to cover the journey.
25 min
15 min
35 min
60 min
Correct Option: D
New speed = 6/7 of usual speed Now, time taken = 7/6 of usual time (7/6 of the usual time) - (usual time) = 10 min ⇒ 1/6 of the usual time = 10 min ∴ Usual time = 60 min