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student18329

Q20

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  • leung_po_chuen
    2020-09-12 14:23:05

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  • 解數雜貨店
    2020-09-12 14:44:54
    a) Speed of A = 60/2 = 30 Distance = 60 - 30 × 45/60 = 37.5 km b) Speed of B = (55-30)/(75/60) = 20 km/h Time for B to travel 5 km = 5 / 20 = 15 min Add this time to 9:30 am = 9:45 am c) After 8:30 am, A and B travel (37.5-30) km to meet. Time to travel 7.5 km = 7.5/(30+20) = 0.15 h = 9 min Add this to 8:15 am = 8:24 am d) No, the speed of B is less than the speed of A
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