In a school, there are 20 teachers either teach english or maths. Out of these 12 teachers teach english only and five teachers yeach both english and maths. find how many teachers teach only maths
A train covered a certain distance at a uniform speed. If the speed of the train would have been 15km/hr more,it would have taken 1.2 hours less than the scheduled time. If the speed of the train would have been 12km/hr less,it would have taken 1.5 hours more than the scheduled time. Find the distance covered by the train.