Question

a car takes 2 hour to reach a destination by travelling at the speed of 60 km/h.How long will it take when the car travels at the speed of 80 km/h?​

Answer 1

Given -

• Speed = 60 km/h

• Time = 2 hours

To find -

• Time taken to cover the same distance at a speed of 80km / h.

$\huge\bold{Case~1 :}$

Speed = ( Distance/Time )

${: \longrightarrow}$Distance = (speed × Time)

= (60×2)km

= 120 km.

$\bf\blue{ The~car~travels~a~distance~of~120km}$

$\huge\bold{Case~2 :}$

• Distance = 120km

• Speed = 80km/h

Distance = (speed × Time)

Time = ${\sf{\large { \:\:\: \dfrac{Distance}{speed}\: }}}$

$\implies{\sf{\large { \:\:\: \dfrac{120}{80}\: }}}$

⠀⠀

$\implies{\sf{\large { \:\:\: \dfrac{3}{2}\: }}}$

⠀⠀

1 hour = ${\sf{\large { \:\:\: \dfrac{1×60 }{2}\: }}}$

${ \longrightarrow}$ $\bf\underline{1 hour = 30min }$

It will take$\bf\red{ 1~hour~30~minutes}$ to cover.