Question

A car covers first 100 km at 10 kmph and the next 400 km at 40 kmph. Find its average speed?
Select one:
a. 20 kmph
b. 40 kmph
C. 30 kmph
d. 25 kmph​

Answer 1

Answer:

Step-by-step explanation:

Speed=dist/t

1st situation:

10km/s=100km/t

t=10s

2nd situation:

40kmph=400km/t

t=10s

Now average speed =total dist/total time

Total dist=100+400=500

Total time=10+10=20

Average speed=500/20kmph

=25kmph

Answer 2

Answer:

25km/hr

Step-by-step explanation:

Case I:-                                                               Case II:-

T= 100÷10                                                            T= 400÷40

 =  10s                                                                    = 10s

Average Speed:- 100+400÷10+10

                         :- 500÷20

                          :- 25km/hr