Which of these errors are random? a. trial time is recorded with a watch that is a half second off each minute. b. the door to a dark room is opened while an x-ray is being developed. c. a balance was not zeroed before being used to measure the mass of an object. d. a student misreads the temperature on a thermometer. e. the use of a cell phone interferes with the radio frequency of an electronic device. check all that apply.

B. The door to a dark room is opened while an X-ray is being developed.

E. The use of a cell phone interferes with the radio frequency of an electronic device.

Explanation:

Correct on e2020.

the answer would be c

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min