Question

Place a and b are 80 km apart from each other on a highway a car starts from a and b another from b at the same time if they move in same direction they meet in 8 hours and if they move towards each other they meet in 1 hour 20 minutes find the speeds of car from teachoo

Answer 1

let speed of A be a km/hr and speed of B be b km/hr

distance = 80km

ATQ

80=(a-b)*8 and 80 =(a+b)*(4/3)

a-b =10 and a+b=60

a= 35 , b =25

Answer 2

Answer:

Speed of Car A  and B are 35 km / hr and 25 km / hr respectively.

Step-by-step explanation:

Let the speed of car at A is x km / hr and at B is y km / hr

Case 1.

8 x - 8 y = 80

x - y = 10

x = 10 + y ... ( i )

Case 2.

4 / 3 x + 4 / 3 y = 80

x + y = 60

x = 60 - y ... ( ii )

From ( i )  and  ( ii )

10 + y = 60 - y

y = 25

Putting value of y in ( i )

x = 10 + 25

x = 35 .