15 minutes = ____ % of 1 hour.
1 hour = 60 minutes ⇒ 15 minutes = 1560 hour ⇒ 1560×100 =14×100 = 25 %
A train is travelling at a constant speed covers a distance of 320 km in 6 hours 40 minutes. The distance covered by the train in 1 hour 15 minutes is
B starts after A has gone 1 kilometre and over takes A in 15 minutes walking at a rate of 8 kilometres an hour. Find A's speed.