Question

A car travels at a speed of 50 km/h for
30 min, at 30 km/h for the next 15 min and
then at 70 km/h for the next 45 min. What is
the average speed of the car? ​

Answer 1

Answer:

hey mate

Explanation:

here is your answer

Data : v1 = 50km/h T1 = 30 min = 30/60 =0.5 h

V2 = 30 km/h T2 = 15 min = 15/60h =0.25h

V3 = 70 km/h T2= 45 min = 45/60 = 0.75h.

the average speed of the car

v = S1 + S2 + s3/t1+T2+T3

= v1t1 + V2+v2t2 + v3t3 /T1+ T2 +T3

= 50×0.5 + 30× 0.25 + 70 × 0.75/0.5 +0.25 + 0.75 km/h

=25 + 7.5 + 52.5 /1.5 =85.1.5

=85/3/2

= 170/3

=56.66

$thank \\ have \: a \: nyc \: day$