Jeff takes 20 minutes to jog around the race course one time, and 30 minutes to jog around a second time. what is his average speed in miles per hour for the whole jog if the course is 3 miles long?

7.2 average miles per hour

Cross multiply to solve for x:

6miles/ 50 minutes = X (how many miles)/ 60 minutes

6*60=50x

360=50x

360/50= x

7.2 = x

ans.

heterothermic organisms include those organisms that can switch between homeothermic (having body temperature higher than environment) and poikilothermic (having variation in internal body temperature) strategies.

some migratory birds show heterothermy as they decrease their metabolic rate during cold nights to keep their body temperature low. drop in metabolic rate allows increase in production efficiency of birds that reduces the internal body temperature to make it equal to external cold temperature during cold nights.

thus, the correct answer is 'birds allow their temperature drop in order to increase their production efficiency.'

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