Question

1 hr 20 min:2 hrs find the ratio in lowest term

Answer 1

(i) 1 hour 20 min : 2 hour

= (1 x 60 + 20) minutes : 2 x 60 minutes

= 80 minutes : 120 minutes

(∵ 1 hour of = 60 minutes)

= 80/120 = 2/3

= 2 : 3

(ii) 4 weeks : 49 days = (4 × 7) days : 49 days

(∵ 1 week = 7 days)

= 28 : 49 = 28/49 = 4/7 = 4 : 7

(iii) 3 years 4 months : 5 years 5 month

= (3 × 12 + 4) : (5 × 12 + 5)

(∵ 1 year = 12 months)

= 40 : 65

= 40/65 = 8/13 = 8 : 13

(iv) 2 m 40 m : 1 m 44 cm

(2 × 100 + 40) : (1 × 100 + 44)

(∵ 1 m = 100 cm)

240 : 144

= 240/144 = 10/6 = 5/3 = 5 : 3

(v) 5 kg 500 gm : 2 kg 750 gm

(5 × 1000 + 500) : (2 × 1,000 + 750)

(∵ 1 kg = 1,000 gm)

= 5,500 : 2,750 = 5,500/2,750 = 2/1 = 2 : 1

Answer 2

Answer:

1 hours= 60 min

so 1 hr 20 min =80 min and 2 hrs = 80 min

60/80=3/4