Un tren parte de la ciudad A, a las 8 h. con una velocidad de 50 km/h, para llegar a la ciudad B a las 10 h. Allí permanece durante media hora y reanuda la marcha a 80 km/h hasta que llega a la ciudad C una hora más tarde. Calcula la distancia que hay entre las distintas ciudades y la hora de llegada

AB = 100 km; BC = 80 km; AC = 180 km

Arrival time = 11:30

Explanation:

1. Distance from A to B

(a) Travel time

Time = 10:00 - 8:00 = 2.00 h

(b) Distance

Distance = speed × time = 50 km/h × 2.00 h = 100 km

2. Distance from B to C

Distance = 80 km/h × 1 h = 80 km

3. Distances

AB = 100 km

BC =    80 km

AC =  180 km

4. Arrival time

Start from A       = 08:00

Travel time to B =   2:00

Arrive at B          =  10:00

Wait time at B    =    0:30

Start from B        =  10:30

Travel time to C  =   1:00

Arrive at C            = 11:30

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