A fourth seismic station is located 5000 kilo- meters from this epicenter. How long after
the P-waves did the S-waves arrive at the
fourth station?

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant

What is the momentum of a 2 kg object moving at 15 meters per second

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?