Question

Solution please.....​

Answer 1

Answer:

Since both cars move at the same time having 8km apart as difference.

So, Speed =Distance/Time

Speed =80/8

=10km/hour.Ans..(1)

AND,Speed of the car in case of 80 minutes= 1+(20/60)

=4/3hours

Speed = 80/4/3

So,Speed =60km/hour.Ans..(2)

HOPE THIS HELPS..☺️

Answer 2

Given: places A and B are 80 km apart form each other on a highway. A car starts from A and other from B at the same time. If they move in the same direction, they meet in 8 hours and if they move in opposite directions, they meet in 1 hour and 20 minutes.

To Find: the speeds of the cars.

Solution:Let the speed of car from A be ‘a’ and of car from B be ‘b’.

Speed = distance/time

Relative speed of cars when moving in same direction = a + b

Relative speed of cars when moving in opposite direction = a – b

Given, places A and B are 80 km apart form each other on a highway. A car starts from A and other from B at the same time. If they move in the same direction, they meet in 8 hours and if they move in opposite directions, they meet in 1 hour and 20 minutes.

⇒ a – b = 80/8 = 10 ------ (1)

Also, a + b =

$\frac{80}{1 + \frac{20}{60} } = 60$

------ (2)

Adding (1) and (2)

⇒ a - b + a + b = 10 + 60

⇒ 2a = 70

⇒ a = 35 km/hr

Put the value of a in (1).

Thus, b = 35 – 10 = 25 km/hr

Hence, speed of two cars are 35km/h and 25 km/h...

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