a car travels 30 km at a uniform speed of 40 kilometre per hour and the next 30 kilometre at a speed of 20 km per hour find its average speed
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A car travels 30 km at the uniform speed of 40 km/h and the next 30 km at a uniform speed of 20 km/h. Find its average speed.
Answer : 26.67 km/hrs.
Step by step explanation :
We know that,
Speed=Distance / time
.°. Time =dist / speed
Let's see the first case,
s = distance = 30 km
v = speed = 40 km/hr
t = time = 30 / 40
=3/4 hrs
Let's see the second case,
s = 30 km
v = 20 km/hr
t = 30 / 20
t = 3/2 hrs
Avg. Speed =Total distance/ Total time
=(30 + 30) / (3/4) + (3/2)
=60 / ( 3 + 6 ) /4
=60 / 9 × 4
=20 / 3 × 4
=80 / 3
=26.67 ( Approx. )
Hence,
Average speed of the car is 26.67 km/hrs ( Approx. )
HOPE ITS HELP YOU
Answered by
0
Answer:
26.67 km/hrs.
Explanation:
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