Question

a person travel a distance of 360 km between by a car. he covers the first half at a speed of 60 km/h and the other one half at 45 km/h find :
(a) the total time taken to complete the entire journey
(b) average speed of the car​

Answer 1

Answer:

average speed is 2v1v2/v1+v2=2×45×60/105=51.4

total time is 360/51.4

7hr

Answer 2

Answer:

the half of 360km=360/2=180km

Step-by-step explanation:

he covers first 180 km in speed = 60km / HR.

speed = distance / time

60km = 180km / x

60 km / 180 km = x

30km = x

x = 30 km

he covers second 180 km in speed = 45 km / HR.

speed = distance / time

45km = 180km / x

45km/180km=x

0.25km=x

x=0.25km

total speed to complete the journey = 30+0.25=30.25km/hr.

total time to complete the journey = time =distance/time=360/30.25=1,440km

the average speed of a car = 30.25km