the average speed of a car is 20km/hr more than the average speed of a bus. if the car takes 4 hr less than the bus to cover a distance of 300 km find the average speed of the car??
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Answer:
The answer is 30 kilometre per hour and the car goes 50 kilometre per hour.
Step-by-step explanation:
The average speed of the car is 20 km/hr.
Let the speed of the bus be = b
Time taken by the car 4 hours less than the bus.
what is the average speed of the car ?
b/30-4 = 300/b+20
300(b+20)-4b²-80b=300b
4b²+80b-6000=0
b²+20b-1500=0
(b+50)(b-30)=0
b=30 (answer)
cat40:
i didn't understand
please can you explain properly Ur answer is correct but how
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