help, please. It's due tomorrow

A police officer arrives at the scene of the collision of the two snowmobiles to find both drivers unconscious. When the two vehicles collided, their skis became entangled and the two snowmobiles remained locked together as they skidded to a stop. One driver was thrown clear of the mishap, but the other driver remained in the driverâ?Ts seat. The posted speed limit for snowmobiles in this cottage area is 60 km/h. The information the police officer obtained from eye witness accounts and collision scene measurements are provided in table1. One witness described how driver A was thrown horizontally at a constant speed from his seat ( 0.5m above the snow surface) to his final resting position
a, Use the physic of kinematics, projectiles, conservation of momentum, and metric conversions to estimate the pre-collision speed of both vehicles
b, What assumptions did you make in your calculations?
c, Which, if either, of the two vehicles was speeding?
d, How would you respond if asked how confident you were of the results of your calculations? Could you be so sure that vehicle B was speeding that you would recommend the officer charge the driver?
Table1:
Mass of driver A= 80kg
Mass of driver B=90kg
Mass of vehicle A=270kg
Mass of vehicle B=310kg
Direction of vehicle A before collision [E]
Direction of vehicle A before collision [E30N]
Direction of entangled vehicles A and B after collision[E15N]
Length of final skid 18m
Displacement of driver A from point of impact 8m
Time from impact to end of skid 2.5s