mamipusing need your help

cara singkat

1.
75/45 x 60
100 menit /1 jam 40 menit (B)

2.
2 jam 12 menit = 2 1/5 jam = 11/5
121 ÷ 11/5
121 x 5/11
55 km/jam(C)

3.
1 1/2 jamx 70
105 km (A)

4.
54 ÷ 45 = 1.2 = 1 2/10 = 1 1/5 jam = 01.12
09.45 - 01.12 = 08.33 (D)

5.
08.05 - 07.45 =00.20 (20 menit / 1/3 jam)
1/3 x 54
18 km (C)

6.
42÷70 = 0.6 = 6/10 = 3/5 jam = 36 menit = 00.36
10.20 - 00.36 = 09.44 (B)

7.
25/60 = 5/12
5/12 x 12 = 5 km(D)

8.
49÷70 = 0.7 = 7/10 jam = 42 menit = 00.42
06.15 + 00.42 = 06.57 (A)

Cara cepat kalau butuh jawaban,tapi kalau pake cara ga disarankan pake cara ini walaupun benar