Question

Two cars start from the same time at the same direction the speed of first car is 70 km per hour and that of the second car is 20 metre per second what is the distance between the cars of after 1 hour 15 minutes

Answer 1

Answer:

first cars speed=70km=70×1000/3600= 19.4m/s(change 70km/h into Meters/s)

second cars speed =20m/s

then time =1h and 15min =4500sec (I changed it to sec)

we know that

distance(D)/relative velocity(Vb -Va)=time(t)

so D=t×relative velocity

D=4500×(20-19.4)

D=2700m

D=2.7km