Sadie Sofa

X and Y are two stations which are 320 miles apart. A train starts at a certain time from X and travels towards Y at 70 mph. After 2 hours, another train starts from Y and travels towards X at 20 mph. At what time do they meet?

two equal masses m placed 2 meters apart have a gravitational constant of 6.7 *10^-9 N what is m (G= 6.7 *10^-11 N m^2kg^-2)

An arc subtends an angle of 1050 at the center of a circle of a circle of radius 6 cm. find the length of the arc, if the π is 22/7

70t + 20t - 40 = 320 70t + 20t = 320 - 40 90t = 280 t = 280/90 t = 3.11

set ε={3,6,9,12,15,18,21,24,27,30} What is n(ε)?