If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Roger and natalie travel in similar cars. roger's car drives the two miles to school in 7.5 minutes. natalie drives the same distance in the opposite direction but in only 6.5 minutes. what is true of their velocities?

Kathy spent 5/8 of her money on books and another 1/6 of her money on stationeries. what fraction of kathy’s money was left?

If the tip varies directly with the number of guest which equation represents between the tip, t, and the number of guest, g?