What velocity must a 1340kg car have in order to have the same momentum as a 2680kg truck traveling at a velocity of 15 m/s to the west

Hope this will help

Given 
m1 = 2680kg 
v1 = 15m/s to the west 
m2 = 1340kg 

Solution 
m1*v1 = m2*v2 
v2 = (m1*v1)/ m2=  [(2.68*10^3kg) (15m/s west)]/1.34*10^3 kg= 3.0*10^1 m/s west

Ireally don’t know