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Lili's father goes to work by bike. It takes 45 minutes to get to work. It takes 15 minutes by bus (bus: 60 km / h). What do you do?
Set the bicycle speed to X
45/15=60/X
45X=900
X = 20 (km / h)
It takes dad 45 minutes to go to work by bike and 15 minutes by car. The speed of the car is 60 kilometers per hour. What's the speed of going to work by bike
It takes 15 minutes to get to work by bus.
Arithmetic solution
60×15÷45
=900÷45
=20 (km / h)
A: the speed to the unit by bike is 20 kilometers per hour
Or equation solution
Let's set the speed of cycling to the unit at km / h
45Χ=15×60
Χ=900÷45
Χ=20
A: the speed to the unit by bike is 20 kilometers per hour
The answer can't be 15 km / h
Sure!
No.5 bus runs every 5 minutes from a to B, the whole journey is 15 minutes. Someone rides a bicycle from B
Bus No.5 runs every five minutes from a to B, and the whole journey is 15 minutes. Someone rides a bicycle from B station to A. at the beginning, he just meets a bus. On the way, he meets another 10 buses. When he arrives at a station, he meets another bus. Just about to start, how long has he been riding?
The whole journey of the bus is 15 minutes. Let's assume that the bicycle meets bus No. 1 when it starts
So at this time, car 2 is five minutes away from B, car 3 is ten minutes away, and car 4 is just ready to leave
Because he met another 10 cars on the way, that is, No. 11. When he got to a, No. 12 was just about to leave
So he sent a total of 5, 6, 7, 8, 9, 10, 11, 12 buses from B to a, a total of 8 buses
So a total of 5 * 8 = 40 minutes
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