Question

C) How long does he travel at 30 km/h, if he travels 1.2 h at 20 km/h?​

Answer 1

1.8 hrs

Explanation:

1.2 hr = 20 km/hr

A hr = 30 km/hr

(cross multiply)

30 x 1.2 = 20 x A

(30 x 1.2) / 20 = A

on simplifying...

1.8 = A

Therefore, it takes 1.8 hrs to travel 30 km/hr

[this is totally my method]