Question

1. A car travels 350 km in 7 hours. In how many hours it can travel 600 km. If it is
travelling at uniform speed?​

Answer 1

Answer:

Let the original speed of car is x km \hr

Then time taken in moving 840 km=

x

840

hr

if speed is going 10 km \hr more =x+10

Then time taken in moving 840 km=

x+10

840

hr

∴

x

840

−

x+10

840

=2

⇒840(x+10)−840x=2x(x+10)

⇒2x

2

+20x−8400=0

⇒x

2

+70x+−60x−4200=0

⇒(x+70)(x−60)=0

⇒x=60orx=−70

If x=-70 is not true because speed not negetive

So speed is 60 km \ hr

Answer 2

Answer:

13.8

Step-by-step explanation:

350-----7hrs

690km-----?

7*690/350=x ( ? represent x and do cross

multiplcation)

x= 13.8 hrs