Question

After covering a distance with a uniform speed there is some defect in a train engine and therefore its speed is reduced to 4/5 of its original speed consequently the train reaches its destination late by 45 minutes.Had it happened after covering 18 km more the train would have reached 9 minutes earlier.Find the speed of the trainvand distance of the journey

Answer 1

A shopkeeper mixes 35 kg of wheat which cost him rs.15 per kg with 25 kg of wheat which cost him rs.20 per kg.he sells the mixture at rs.22 per kg.his gain is