Final answer:
By setting up an equation using the formula time = distance / speed and summing the time spent traveling by bus and plane to equal the total trip time of 5 hours, we determine that Holly traveled 300 km by bus. Therefore correct option is A
Step-by-step explanation:
To determine how many kilometers Holly traveled by bus, we can let x be the distance traveled by bus, and since the total trip was 1900 km, the distance traveled by plane would be 1900 - x km.
Given the speeds, we can calculate the time spent on each part of the trip by using the formula
time = distance / speed.
The time spent on the bus is x / 60 hours and the time on the plane is (1900 - x) / 700 hours.
Since the total trip took 5 hours, we set up the equation:
x/60 + (1900 - x)/700 = 5
Solving for x gives us that Holly traveled 300 km by bus.
Therefore, the answer to the question is option (a) Holly traveled 300 km by bus.