After covering a distance of 30 km with a uniform speed there is some defect in a train #maths#viral

After covering a distance of 30 km 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 reached its destination late by 45 minutes. Had it happened after covering 18 kilometres more, the train would have reached 9 minutes earlier. Find the speed of the train and the total distance of the journey." most important cbse class 10 questions