Question

two vehicles start at the same time from one point and move along two roads.at right angle to each other.their speeds are 90km/hr and 72 km/hr respectively.what will be the distance(in metres)between them after 10 second ?

Answer 1

90km/h=25m/s 72km/h =20m/s
When two objects come towards each other their speed are added and this is the relative speed
Relative speed =(20+25)m/s = 45m/s
Distance =speed ×time
=(45 ×10)m =450m