a man travels from his house ti his office at 5 km/hr and reaches his office 20 min late .if his speed had been 7.5 km/hr ,he would have reached his office 12 min early .find the distance from his house to his office.
A is driving along a highway at a speed of 90 km/hr .He is passed by B who is driving on the same highway in the same direction at a constant speed .Twelve seconds after B passes A ,their cars are 100 m apart.The speed of B's car ,in km/hr,is
Points A and B are 90 km apart from each other on a highway. A car starts from A and another from B at the same time. If they go in the same direction they meet in 9 hours and if they go in opposite directions they meet in 9/7 hours. Find their sppeds.