Answer
Choice (b) because:
$\frac{25}{100}\times 2,000,000Cal=500,000Cal$
And since 42,000J per minute = 10,000Cal, we obtain:
$\frac{500,000}{10,000}=50minutes$
Work Step by Step
Choice (b) because:
$\frac{25}{100}\times 2,000,000Cal=500,000Cal$
And since 42,000J per minute = 10,000Cal, we obtain:
$\frac{500,000}{10,000}=50minutes$
