A shopkeeper allows 18% discount on the marked price of an article and still makes a profit of 25%. If he gains ₹106.6 on the sale of the article, then what is the marked price of the article?

Pipes A, B and C can fill a tank in 30 h, 40 h and 60 h respectively. Pipes A, B and C are opened at 7 a.m., 8 a.m., and 10 a.m. respectively on the same day. When will the tank be full?

A, B and C can complete a certain work in 30 days. B and C together can complete the same work in 45 days. If B is 20% more efficient than A, then B alone can complete one-third of the same work in:

Two superfast trains P & Q start from station A & B towards B & A respectively. After passing each other, they take 4 hours 48 mins & 3 hours 20 min to reach B & A respectively. If the train P is moving at 45 kmph. Find the speed of the train Q.