length :
Explanation:
use the distance formula :
- using the formula:
The scale on a model of a frog is 2 cm = 25 mm. Find the actual length
1 answer:
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Answer:
180
Step-by-step explanation:
<em>Here,</em>
<em>b=15</em>
<em>c=9</em>
<em>Now,</em>
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Answer:
60 m/h
Step-by-step explanation:
1. the basic formula is Time=Distance/Speed;
2. total time is time1 (for 84 miles)+time2 (for 130 miles)=time (4 hours);
3. the time for the first 84 mi. is time1=84/S;
4. the time for the rest 130 mi. is time2=130/(S-10);
5. using all the data of items 2-4, it is possible to substitute into the basic formula and resolve an equation:
note, that the value of speed has one condition: s>10. It means, the only value is true: 60 miles per hour.