Question

A car travels at a uniform speed of 30 kmph for 30 minutes and then at a uniform speed of 40 kmph for the next 40 min. Calculate the total distance travelled speed. by car and its average

Answer 1

Answer:

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.

Answer 2

Answer:

Answer:

1st case:

speed =30km/hr

time = 30 min.

= 30/60

=1/2

speed=distance/time

30=distance/1/2

30=distance×2

30/2= distance

15km=distance

2nd case:

speed = 40km/hr

time = 40min.

= 40/60

=2/3

speed = distance/time

40=distance/2/3

40= 3×distance/2

40×2= 3× distance

80= 3× distance

80/3 = distance

distance= 26.67km

total distance =( 15+26.67)km

=41.67km

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