The straight and longest portion of the Trans-Australian railway is 478 km and 193 m long of steel. The region experiences a temperature range of -23.0°C to
50.7°C. By how many meters will the railroad tracks expand or contract? Why is
it a good idea to segment tracks into small pieces?

a.) is the correct answer.

explanation:

a sonic boom is a loud boom that breaks the sound barrier

explanation:

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