A train has a speed of 60 km/h. for the first one hour and
40 km/h for the next half hour. Its average speed in loma
Answers
Answer:
The average speed is 53.3 km/hr
Given:
First hour, speed of the train = 60 km/hr
Next half an hour, Speed = 40 km/hr
Solution:
To calculate the average speed for the travel journey, we need total distance traveled and total time for the travel.
The time taken is one hour and half hour, i.e., t = 60 + 30 = 90 min
\Rightarrow⇒ t = 3/2 hr
Total distance = d1 + d2
d1 = speed × time → d1 = 60 × 1 = 60 km
d2 = speed × time → d2 = 40 × (1/2) = 20 km
\Rightarrow⇒ Total distance d = 60 km + 20 km = 80 km
Average \ speed = \frac{Total \ distance}{Total \ time}Average speed=
Total time
Total distance
= \frac{80}{\frac{3}{2}}=
2
3
80
=80\times\frac{2}{3}=80×
3
2
\Rightarrow⇒ Average speed = 53.3 km/hr
Explanation:
Average speed=(total distance) /total time
=(60×1)+(40×1/2)
60+20 =80