Question

a car takes 2 hours to reach a destination by travelling at the speed of 60km/hr. how long will it take when the car travels at the sped of 80km/hr ?

Answer 1

Answer:

1 1/2 hrs

Step-by-step explanation:

It is given that a car takes 2 hours to reach the destination with a speed of 60km/hr Let it take x hours to reach the destination with a speed of 80 km/hr

It is a case of inverse proportionality(as here, if speed increases then time decreases and if speed decreases the time increases)

So 60 x 2 =80 X x (because x1y1=x2y2)

therefore x= 60 x 2/80 =3/2 hrs=1 1/2 hrs

Answer 2

Answer:

time taken=1 hr 30 min

Step-by-step explanation:

speed= distance/time

case 1:

speed=60 km/hr                time=2hrs            distance=?

d= 60 X 2

d= 120 km

case 2:

speed= 80km/hr        time=?             distance=120km

t=120/80

t=1hr 30min