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Mary is planning to fly to London - Junior Cycle Mathematics - Question 3 - 2014
Question 3
Mary is planning to fly to London. The table shows the flights leaving Dublin Airport (DUB) and arriving in London Heathrow Airport (LHR) on a particular day. - Dep... show full transcript
Worked Solution & Example Answer:Mary is planning to fly to London - Junior Cycle Mathematics - Question 3 - 2014
Step 1
Mary needs to arrive in Heathrow by 10:30 a.m. What is the departure time of the latest flight that she can take from Dublin Airport?
Answer
To arrive by 10:30 a.m. the latest flight she can take is the 08:50 flight, as it arrives in London at 10:15 a.m., which is still before her required arrival time.
Step 2
Step 3
Mary would like to arrive in Dublin Airport 75 minutes before that flight leaves. At what time should she arrive at the airport?
Answer
If the flight departs at 08:50, we subtract 75 minutes:
- 75 minutes is 1 hour and 15 minutes.
- 08:50 - 01:15 = 07:35
Thus, she should arrive at the airport by 07:35.
Step 4
Step 5
Find the average speed of the airplane during the flight, in km/h.
Answer
The flight distance is 464 km and the flight duration is 1.4167 hours. The average speed can be calculated using the formula:
ext{Speed} = rac{ ext{Distance}}{ ext{Time}} = rac{464}{1.4167} \\ ext{Speed} ext{ is approximately } 327.5 ext{ km/h (to one decimal place)}