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A bicycle travels 16 kilometers in 2 hours and an airplane 1200 meters in 2 seconds. What is the speed ratio between a bicycle and an airplane?
1 hour = 60 minutes = 3600 seconds
2 hours = 7200 seconds
1km = 1000M
16km = 16000m
16000 / 7200 = 20 / 9 m / S
1200 / 2 = 600 meters per second
20 / 9 to 600 = 1 to 270
A bicycle travels 16 kilometers in 2 hours and an airplane 1200 meters in 2 seconds. What is the speed ratio between a bicycle and an airplane?
Bicycle speed: 16 / 2 = 8km / h = 8000 m / h = (8 / 3.6) m / S
Aircraft speed: 1200 / 2 = 600 m / S
Speed ratio: (8 / 3.6) / 600 = 1 / 270
A plane is flying at a speed of 500 kilometers per hour
After a plane flew from place a to place B at the speed of 500 km / h, it immediately turned around in the air and flew back to place a at the speed of 400 km / h. It took 4.05 hours in total
Let's set the time of going to be x hours
500:400=（4.05-X）：X
X=1.8
1.8 * 500 = 900 km
A motorcycle chased the moped at a speed of 45 km / h, the speed of the moped was 20 km / h, and the motorcycle took 2 hours
It took the motorcycle two hours to catch up with the moped. The moped started several hours earlier than the motorcycle
45 × 2 △ 20 = 4.5 hours
Early departure: 4.5-2 = 2.5 hours
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