Question

A car travels 70 kilometres in one hour before some fault happens, then it travels for 120 km at 30 kmph. For the entire trip, average speed is ​

Answer 1

Answer:

Correct option is B)

If a car travels a distance d at rate r

1

and returns the same distance at rate r

2

, then

Average speed =

totaltime

totaldistance

=

d/r

1

+d/r

2

2d

=

r

1

+r

2

2r

1

r

2

;

∴x=

70

2.30.40

=

7

240

34km/hr.

Answer 2

Answer:

total distance covered by car=70+120=190

And total time taken =1+120÷30 (As time =d÷s)

so tota time taken= 1+ 4=5

we know average speed = total distance covered /total time taken

=190÷5

=38

hence the average speed=38 km/h