Question

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Answer 1

Explanation:

The total time for the journey is given as,

t=

v

1

d

1

+

v

2

d

2

=

40

30

+

20

30

=2.25hour

The average speed is given as,

v

avg

=

t

d

1

+d

2

2.25

30+30

=26.67km/h

Thus, the average speed of the car is 26.67km/h

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Answer 2

I)90 min

II) 57/90 km/hr.

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