Asked by Anonymous

James and Jack are driving at 80 km/h and 60 km/h respectively. Every hour, James increases his speed by 3 km/h. Find their speed difference after 5 hours. Please explain method clearly. What I am confused with is, for the first hour do you start with 80 km/h speed and 60 km/h speed or do you start with 82 km/h and 57 km/h. In what types of questions would you start with the first and in what question would you start with the second pair of speeds. Another question is: John is driving at a speed of 50 km/h. If he increases hispeed by 20% every hour, then how many km can he cover in 3 hours? This question is using the original speed 50km/h as the speed for the first hour. Please help... really stuck...
Answered by bobpursley
james speed: Vj=80+3t where t is hours elapsed.
speed difference= vj-60=20+3t after three hours, =20+15
Second question:
distance=speed*time= (50(1+1.2+1.2^2) = 182km
Answered by Anonymous
Pls explain clearly
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