Eli takes a typing test and types all 360 words in 1/15 hour. he takes the test a second time and types the words in 1/20 hour. was he faster or slower on the second attempt

Faster on seccond attamp  he typed 90 and first attamped and 120

Step-by-step explanation:

phosphate, calcium ion, chloride ion, neon atom

step-by-step explanation:

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.