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標題:

help!!!Maths(speed)

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• 中國雪災英文係咩...-
• 求Fiona舊歌,最好是link@1@

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發問:

Two cities (X and Y) are connected by means of a highway. Car A leaves city X at 10:00am and travels at a speed 52km/h towards city Y. 20 minutes later, car B leaves city X and travels at a speed 60km/h towards city Y. When will the car B catch up car A?

最佳解答:

Let x be required time (20/60)52+52x=60x 52(1/3)=8x x=2.17( 3 Significant Digits) 2.17hour =2hours10minutes 12:10 p.m will the car B catch up car A

其他解答:

Let x be required time (20/60)52+52x=60x 52(1/3)=8x x=2.17( 3 Significant Digits) 2.17hour =2hours10minutes 12:30 p.m will the car B catch up car A