A particle (A) moves due north at 3 km/h, another particle (B) due west at 4 km/h. The relative velocity of A with respect to B is (tan 37∘=3/4)
A car A is going north-east at 80 km/h and another car B is going south-east at 60 km/h. Then the direction of the velocity of A relative to B makes with the north an α angle such that tanα is :