In hand-pumped railcar races, a speed of 32 km/h has been achieved by teams of four. A car of mass 350 kg is moving at that speed toward a river when Carlos, the chief pumper, notices that the bridge ahead is out. All four people (of mass 75 kg each) jump simultaneously backward off the car with a velocity that has a horizontal component of 4 m/s relative to the car after jumping. The car proceeds off the bank and falls in the water a distance 25.0 m off the bank. 

(a) Estimate the time of the fall of the railcar.

(b) What happens to the team of pumpers?