7. Diana took 2 hours to cycle from town X to town Y. Her average speed was 10 kilometers per

hour.

a) Find the distance between the two towns. (2 marks)

b) If her average speed was increased by 2 kilometers per hour, how much time would she take

for the journey? (2 marks)

a.) 20 kilometers

b.) 1.67 hours

Step-by-step explanation:

a.) formula = speed = distance/time

Speed = 10km/hr

Distance=unknown

Time=2hrs

Therefore from formula, distance=speed x time

10 x 2

20 kilometers

b.) If average speed is increased by 2km/hr then

total speed = 2+10=12km/hr

Distance remains constant therefore distance = 20km

Therefore time = distance/speed

20/12

= 1.67 hours