Car travels with a constant speed of 30 km per hour for 15 minutes. an

1.	Car travels with a constant speed of 30 km per hour for 15 minutes. and then quickly speed up to 50 km/h to be maintained for 30 minutes. Then its average speed in km/h would be:
Answer» ong>Answer: here is your answer plz mark as brainliest Explanation: SPEED 1 = 30km/hr ------1 speed 2 = 50km/hr ------2 time 1 = 15 mins -------1 time 2 =30 mins -------2 now first we CONVERT mins to hr time 1 = 15 mins =0.25hr and time 2 = 30 mins = 0.5 hr now we CALCULATE the distance i.e speed1 = distance1 / time1 ------3 speed 2 = distance 2 / time 2 -------4 therefore distance in the 3rd and 4th cases will be 7.5km and 25 km respectively now we calculate the average speed which is average speed = TOTAL distance travelled / total time taken therefore, total distance =7.5 km +25km=32.5km and total time = 0.25+0.5=0.75hr average speed = 32.5/0.75 = 43.3333km/hr

Car travels with a constant speed of 30 km per hour for 15 minutes. and then quickly speed up to 50 km/h to be maintained for 30 minutes. Then its average speed in km/h would be:

Answer»

ong>Answer:

here is your answer plz mark as brainliest

Explanation:

SPEED 1 = 30km/hr ------1

speed 2 = 50km/hr ------2

time 1 = 15 mins -------1

time 2 =30 mins -------2

now first we CONVERT mins to hr

time 1 = 15 mins =0.25hr

and time 2 = 30 mins = 0.5 hr

now we CALCULATE the distance i.e

speed1 = distance1 / time1 ------3

speed 2 = distance 2 / time 2 -------4

therefore distance in the 3rd and 4th cases will be 7.5km and 25 km respectively

now we calculate the average speed which is

average speed = TOTAL distance travelled / total time taken

therefore, total distance =7.5 km +25km=32.5km

and total time = 0.25+0.5=0.75hr

average speed = 32.5/0.75 = 43.3333km/hr

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