With an average speed of 40km/hr. a train reached its destination in time. If it goes whith an average speed of 35km/hr, it is late by 15 minute . The total journey is?

30 km
40 km
70 km
80 km

Correct Answer: 70 km

Explanation:

Let total journey be y km.
From question y/35 - y/40= 15/60
⇒ y = ( 35 x 40 )/ ( 4 x 5 ) = 70
∴ Total Journey = 70 km

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