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Answer :
(a)Given, Speed of cycle : Speed of Scooter = 15 km per hour : 30 km per hour
\(\Rightarrow\) 15 :30
\(\Rightarrow\) 1:2
Hence we get the ratio as 1 : 2
(b)Given, 5 m to 10 km
\(\Rightarrow\) 5 m : 10 \(\times\) 1000 m [∵ 1 km = 1000 m]
\(\Rightarrow\) 5 m : 10000 m
\(\Rightarrow\) 1 : 2000
Hence, the ratio = 1 : 2000
(c)Given, 50 paise to ₹ 5
\(\Rightarrow\) 50 paise : 5 \(\times\) 100 paise [∵ ₹ 1 = 100 paise]
\(\Rightarrow\) 50 paise : 500 paise
Hence we get the ratio as 1 : 10