A group of three friends cycle from Llanfyllin to Vyrnwy at 12 km/h. They then take the same amount of time to cycle from Vyrnwy
to Bala at 16 km/h.
What is their average speed for the journey from Llanfyllin to Bala?

x is greater than 5

step-by-step explanation:

2x+7 is greater than 17

    -7                           -7

2x is greater than 10

divide by 2 each side

x is greater than 5

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.