Answer:

a 1:3

b 4:15

Step-by-step explanation:

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Step-by-step explanation:

(a) 30 minutes to 1.5 hours

60 minutes = 1 hour

Hence, 30 minutes = 0.5 hour

Hence, 30 minutes to 1.5 hours = 0.5 / 1.5

Here, HCF of 0.5 and 1.5 is 0.5

= (0.5 ×1) / (0.5 × 3)

= 1 / 3

Therefore, the ratio of 30 minutes to 1.5 hours is 1 : 3.

(b) 40 cm to 1.5 m

100 cm = 1m

40 cm = 0.4 m,

Hence, 40 cm to 1.5 m = 0.4 / 1.5

= 4 / 15

Therefore, the ratio of 40 cm to 1.5 m is 4 : 15

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