If Tanya burns 7 calories for every metre she walks, then how many times should she complete the entire track so that she burns 448 calories? (All dimensions are in m and take $π$ = 22/7)

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Solution

The correct option is B
1

Perimeter of the track = Perimeter of the 2 semi-circles + length of the 2 straight paths

= $2 \times π r + 10 + 10$

= $2 \times \frac{22}{7} \times 7 + 10 + 10$

= $64 m$

Total calories she burns per round
= $7 \times 64 = 448$ calories

Number of rounds
= $\frac{C a l o r i e s t o b e b u r n t}{C a l o r i e s b u r n t p e r r o u n d} = \frac{448}{448}$ = 1 round

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If Tanya burns 7 calories for every metre she walks, then how many times should she complete the entire track so that she burns 448 calories? (All dimensions are in m and take π = 22/7)

The correct option is B 1 Perimeter of the track = Perimeter of the 2 semi-circles + length of the 2 straight paths = 2×πr+10+10 = 2×227×7+10+10 = 64 m Total calories she burns per round = 7×64=448 calories Number of rounds = Calories to be burntCalories burnt per round=448448 = 1 round

If Tanya burns 7 calories for every metre she walks, then how many times should she complete the entire track so that she burns 448 calories? (All dimensions are in m and take $π$ = 22/7)