Question

two cars a and b are (starting moving at he same time,from same point) are moving with the average speed of 40km/h and 50km/h respectively in the same direction . find how far will car b from car a after 3 hour​

Answer 1

Answer:

Let t hrs. be the time taken by the car B to reach the crossing point

Hence, A will take (t+1) hrs. to reach the same point

Speed of car B=50 km/hr

Distance covered before the crossing =50 × t

Now using the strategy (4), we know that the total distance covered by the two cars is the total distance between their starting points.

i.e. 40(t+1)+50t=400

⇒ 40t+50t+40=400

⇒ 90t=360

⇒ t=4 hrs

Hence, the distance covered by car B=50 × 4=200 km.