Question

A car covers its first 72 km at the speed of
60 km/h and the rest 45 km at the speed of
75 km/h. Find its average speed.​

Answer 1

Answer:

3.12 m/s

=

11.232 km/h

Not sure bro.

Answer 2

Answer:

45 km/h

Step by step explaination

Distance1= 72km

speed1= 60km/h

time1= s1÷v1

= 72÷60 ( cutting)

t1 = 6/5h

distance 2= 45km

speed2= 75km/h

time2= s2÷v2

=45÷75 ( cutting)

t2= 3/5h

Average speed=

total distance traveled÷total time taken

total distance= s1-s2

=72-45

=27km

total time= t1-t2

= 6/5-3/5

taking LCM

=6-3÷5

=3/5h

average speed= 27÷3/5

=27÷3*5

cutting 27 by 3

=9*5

=45

Average speed= 45 km/h