No, the game is not fair because grace has a higher probability of choosing a marble of another color
To find the rate in miles per hour, divide the miles by the hours.
(1 1/2 miles)/(3/5 hour) =
= 3/2 miles * (5/3 hour)
= 5/2 mph
= 2 1/2 mph
Her walking rate is 2 1/2 mph.
(4 1/2 miles) / ( 2 1/2 mph) =
= 9/2 miles / (5/2 mph)
= 9/2 * 2/5 hours
= 9/5 hours
= 1 4/5 hours
From 9:00 a.m. to 11 a.m., she has 2 hours, but she only needs 1 4/5 hours to walk, so she will make it to work on time.
Answer:
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The equation in terms of "t"
1/t = ¹/₂₁ + ¹/₁₅
On solving the equation "t"= 8 ³/₄ days
Step-by-step explanation:
Time taken by roofer to shingle a roof- 15 hours
Time taken by apprentice-21 hours
Time required to shingle if both worked together- “t” hours
If roofer shingles the roof in 15 hours
Part of the roof he would shingle in 1 hours= ¹/₁₅
Similarly, part of the roof shingled by apprentice in 1 hour- ¹/₂₁
Part of the roof shingles when they worked together for 1 hours- 1/t = ¹/₂₁ + ¹/₁₅
Total time taken= 1/t = ¹/₂₁ + ¹/₁₅
1/t= ⁽²¹⁺¹⁵⁾ /₃₁₅
t= 315/36 = 8 ³/₄ days
