Two students start from opposite ends of an 8 km course walking towards each
other. one student is walking at a rate of 4 km/h and the other is walking at a
rate of 6 km/h. after how long will the students meet?

48 minutes

because in an hour they will go 10km in total, but the course is only 8 Km long, which is .8 times 10 Km so the time should be .8 times one hour which is .8*60= 48 minutes

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.