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A person covered a distance of 250 km at a certain speed. If his speed is 20% less, he would have covered the same distance in hours less time. His speed (in km/hr), initially was:

You are painting a wall that has a circular window as shown in the figure.You have enough paint to cover 70 sq ft of the wall.Do you need to certain buy more paint? Explain how you got your answer.

A train covered a certain distance at a uniform speed. If the train had been 5 kmph faster, it would have taken 3 hours less than the scheduled time. And, if the train were slower by 4 kmph, it would have taken 3 hours more than the scheduled time. Find the length of the journey.