Find the ratio of
(i) 75 cm to 1 km
(ii) 45 sec to 2 hours

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Solution

$(i) . We know that : 1 km = 100000 cm Now, \frac{75 cm}{1 km} = \frac{75 cm}{100000 cm} = \frac{3}{4000} = 3 : 4000 (ii) . We know that : 1 hour = 3600 sec 2 hours = 2 \times 3600 = 7200 sec Now, \frac{45 sec}{2 hrs} = \frac{45 sec}{7200 sec} = \frac{45}{7200} = \frac{1}{160} = 1 : 160$

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Similar questions

Find the ratio of the following in the simplest form:
(i) $75$ paisa to $R s . 3$

(ii) $35$ minutes to $45$ minutes

(iii) $8 k g$ to $400 g m$

(iv) $48$ minutes to $1$ hour

(v) $2$ metres to $35$ cm

(vi) $35$ minutes to $45$ seconds

(vii) $2$ dozen to $3$ scores

(viii) $3$ weeks to $3$ days

(ix) $48$ min to $2$ hour $40$ min

(x) $3 m 5 c m$ to $35 c m$ .

12

: 30

= 8

: 20

1

1 : 1

Question 1 (a)
Find the ratio of the following:
Speed of a cycle 15 km per hour to the speed of scooter 30 km per hour.

Are the following statements true?

(a) 40 persons: 200 persons = Rs 15: Rs 75

(b) 7.5 litres: 15 litres = 5 kg: 10 kg

(d) 32 m: 64 m = 6 sec: 12 sec

(e) 45 km: 60 km = 12 hours: 15 hours

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