Question

В один из зимних каникул мальчик 2 3/5 ч катался на лыжах, а на коньках на 1 4/5 ч меньше Сколько всего времени он катался на лыжах и коньках ?

Answer 1

Примем:

Х - мальчик катался на лыжах, час

Y - мальчик катался на коньках

2 3/5 час = 2 час+60 мин/5*3=2 часа 36 мин мальчик катался на лыжах

1 4/5 = 1час+60/5*4=1 час 48 мин

2 час 36 мин - 1час 48 мин = 48 мин мальчик катался на коньках

тогда

X+Y=2 часа 36 мин + 48 мин = 3 час 24 мин = 3 час+24/60мин=3 2/5 час мальчик катался на лыжах и коньках

(другой вариант:2 3/5+(2 3/5-1 4/5)=2 3/5+4/5=3 2/5 часа)

(другой вариант: 2 3/5 = 2,6 час; 1 4/5=1,8 час; 2,6+(2,6-1,8)=2,6+0,8=3,4 часа, что равно 3 2/5 часа или 3 часа 24 мин)

Answer 2

Calculation of Time Spent on Skis and Skates

To calculate the total time the boy spent on skis and skates during his winter vacation, we need to add the time he spent on each activity.

The boy spent 2 3/5 hours on skis and 1 4/5 hours less on skates than on skis.

To find the total time, we can subtract the time difference from the time spent on skis.

Calculation:

Time spent on skates = Time spent on skis - Time difference

Time spent on skates = 2 3/5 hours - 1 4/5 hours

To subtract fractions, we need to have a common denominator. In this case, the common denominator is 5.

Time spent on skates = (2 * 5 + 3) / 5 hours - (1 * 5 + 4) / 5 hours

Time spent on skates = (13/5) hours - (9/5) hours

To subtract fractions, we need to have the same denominator. In this case, the denominator is already the same, so we can subtract the numerators.

Time spent on skates = (13 - 9) / 5 hours

Time spent on skates = 4/5 hours

Now, we can find the total time spent on skis and skates by adding the time spent on skis and the time spent on skates.

Total time spent on skis and skates = Time spent on skis + Time spent on skates

Total time spent on skis and skates = 2 3/5 hours + 4/5 hours

To add fractions, we need to have a common denominator. In this case, the common denominator is 5.

Total time spent on skis and skates = (2 * 5 + 3) / 5 hours + 4/5 hours

Total time spent on skis and skates = (13/5) hours + (4/5) hours

To add fractions, we need to have the same denominator. In this case, the denominator is already the same, so we can add the numerators.

Total time spent on skis and skates = (13 + 4) / 5 hours

Total time spent on skis and skates = 17/5 hours

Therefore, the boy spent a total of 17/5 hours on skis and skates during his winter vacation.