1. Miss Wang goes to Guangzhou by train from Beijing Railway Station. 10 hours later, the train traveled five tenths of the whole journey. How long does it take from Beijing to Guangzhou?

The whole journey within one hour: 5/11÷10 =1/22.

Then the whole journey needs: 1÷ 1/22=22 hours.

2. Li Di can input 30 Chinese characters in two thirds of a minute. According to this calculation, how many Chinese characters can he input in half an hour?

1 min can be entered as: 30÷2/3=45.

30 minutes (half an hour): 45×30= 1350 (each)

Cong Cong walked 60 meters in five minutes and six seconds. How many meters can he walk in three quarters of an hour at this speed?

1 min walking distance: 60÷5/6=72 (m)

Three quarters of an hour =45 minutes;

45-minute walking distance: 72×45=3240 (m)

4. A piece of land has 10 hectare, which can be plowed in 0.75 hours with two tractors. How many hectares of farmland does each tractor plow per hour on average?

10÷0.75÷2=6 2/3 hectares.