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Please solve accurate and exact question-1 with two sub-parts (b & c). I'll rate it up thanks

Question 1
a) Use Ho = 70 km/s/Mpc to calculate ty. (Note: 1 Mpc
= 3.09x1019 km)
b) If a galaxy is 1427 Mpc away from Earth what is its
recessional velocity? (Assume Ho = 70 km/s/Mpc)
c) If a galaxy has a recessional velocity of 376 km/s, how
far away from Earth is it? (Assume Ho = 70 km/s/Mpc)
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this question.

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