Question

A car travels 80km in two hours, how much time is required to cover 140km with the same speed.

Answer 1

If it covers 80km in 2 hours it means that 1 km =120 minutes/80km

Also,140km=120/80*140=3/2*140=210 minutes

The answer is 210 minutes or 210/60=3 and half hour.

Hope it helps.

Answer 2

Distance

d1 = 80km

d2 = 140km

Time

t1 = 2 hrs

t2 =?

As we know,

$speed = \frac{distnce}{time}$

And for both the conditions speed is same

$\frac{d1}{t1} = \frac{d2}{t2}$

$\frac{180}{2} = \frac{140}{t2}$

$90 = \frac{140}{t2}$

$t2 = \frac{140}{90}$

$t2 = 1.56$

Thus time taken to cover 140 kms is 1.56hrs