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:
Answers
Answer:
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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
Answer: 43.33 km/hr
Explanation:
v1=30
v2=50
t1=15min=0.25 hr
t2=30min=0.5hr
d1=v1*t1=30*0.25=7.5km
d2=v2*t2=50*0.5=25km
total distance = 7.5+25=32km
total time = 0.75 hr
avg speed = total distance/total time = 32/0.75
=43.334 km/hr