Thời gian người đó làm 5 sản phẩm là:
12 giờ - 8 giờ = 4 giờ
Thời gian trung bình người đó làm 1 sản phẩm là:
4 : 5 = 0,8 giờ
Đổi 0,8 giờ = 48 phút
Đáp số: 48 phút

21 km / h

 

Tổ 1 làm trong 1 giờ được 1/3 công việc

Tổ 2 làm trong 1 giờ được 1/2 công việc

hai tổ  làm trong 1 giờ được số phần  công việc là: 

\(\dfrac{1}{3}+\dfrac{1}{2}=\dfrac{5}{6}\) (công việc)

Thời gian để hai tổ hoàn thành công việc là:

\(1:\dfrac{5}{6}=1,2\) (giờ)

Trong 1 giờ tổ 1 làm một mình được:
1 : 3 = 1/3 (công việc)
Trong 1 giờ tổ 2 làm một mình được:
1 : 2 = 1/2 (công việc)
Trong 1 giờ cả 2 tổ làm được:
1/3 + 1/2 = 5/6 (công việc)
Cả 2 tổ làm trong số giờ để hoàn thành công việc đó là:
1 : 5/6 = 6/5 (giờ)
Đổi 6/5 giờ = 1 giờ 12 phút
Đáp số: 1 giờ 12 phút

Đổi 15p45s=15,75p

Trugn bình 1 bông hoa làm trong

15,75 : 5=3,15(phút)

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P?XC\.

Đổi 5 giờ 15 phút=5,25 giờ

Thời gian chuyển gạo bào kho thứ 2 là:

5,25 : 3=1,75(giờ)

Đáp số: 1,75 giờ

`32` phút `8` giây `xx3:4`

`= 96` phút `24` giây `:4`

`=24` phút `6` giây`

`=>C`

nói nhanh tick cho

 

Số tuổi của dì An là:

(62-12):2=25 tuổi 

Đ/S: 25 tuổi

Đáp án

C 24 phút 6 giây

`25,2` giờ `:3`

`=8,4` giờ

`= 8` giờ `+ 0,4 `giờ

`= 8` giờ ` 24` phút

bạn xem lại đề ạ

Tính 14 ngày 6 giờ : 9 ta được kết quả:

A. 1 ngày 14 giờ             B. 1 ngày 13 giờ

A

Trung bình mỗi giờ xe đó đi được là 

    56÷1,5=112/3 km

xe máy đó đi trong số giờ là 

140÷ 112=3=3,75 giờ = 3 giờ 45 phút 

                                       đáp số 3 giờ 45 phút 

Vận tốc ô tô là:

56 : 1,5=112/3 (km/h)

Quang đường dài 140km thì đi hết số giờ là

140 : 112/3=3,75(giờ)