A) How far does a bicycle travel in 30 sec, if it initially moves with a speed of 4 ft/sec and accelerates the entire time at the rate of 0.2 ft/sec² ?

B) Light travels at a speed of 3 x 10⁸ m/s. At closest approach, the planet Mars is approximately 7.8 x 10¹⁰ m away from the Earth. How long would it take a radio signal to travel to Mars and back again to Earth?

Please show your work and explain in detail, thank you!