C, because the opposite would be + 2 and none of the ions have that charge
7hrs/ =x
21hrs 189
1323=7x
7 7
189=x
the speed of the boat in still water is 189
i got the answer by setting a proportion.
hope it work
Step-by-step explanation:
Below is an attachment containing the solution
Step-by-step explanation:
play started 16:30
its 115 min long = 1:55 hours
16:30+ 1:55=18:25 hours
now he takes 30 min to reach bus stop
18:25 + 30 mins = 18:55
therefore, he reaches the bus stop 10 mins late