Question

Two cars start from tthe same point in the opposite directions. One car travels at the speed of 90km/h and the other at 75km/h. After how many hours will they be 495 km apart?

Answer 1

Two cars start from the same point in opposite direction

Speed of car 1 = 75 km / hr

Speed of car 2 = 90 km / hr

___________________

As both the cars are moving in opposite directions the relative speed of the will be

= Speed of car 1 +Speed of car 2

= 75 + 90

= 165 km / hr

_____________________

We need to find the time at which both the cars are 495 km apart

Distance = 495 km

we know that ,

$\implies \mathtt{speed \: = \dfrac{distance}{time} }$

$\implies \mathtt{time\: = \dfrac{distance}{speed} }$

$\implies \mathtt{time \: = \dfrac{495}{165} }$

$\implies \boxed{ \mathtt{ \red{time\: =3 \: hrs}}}$

After 3 hrs both the cars will be 495 km apart

Answer 2

Two cars start from the same point in opposite direction

Speed of car 1 = 75 km / hr

Speed of car 2 = 90 km / hr

___________________

As both the cars are moving in opposite directions the relative speed of the will be

= Speed of car 1 +Speed of car 2

= 75 + 90

= 165 km / hr

_____________________

We need to find the time at which both the cars are 495 km apart

Distance = 495 km

we know that ,

$\implies \mathtt{speed \: = \dfrac{distance}{time} }$

$\implies \mathtt{time\: = \dfrac{distance}{speed} }$

$\implies \mathtt{time \: = \dfrac{495}{165} }$

$\implies \boxed{ \mathtt{ \red{time\: =3 \: hrs}}}$

After 3 hrs both the cars will be 495 km apart