Question

Diana takes twice as long as her sister to swim across a pool. Diana swims across in 410 410 seconds. How many seconds does her sister take to swim across?

Answer 1

Her sister swims across in half the time, so divide Diana’s time of 410 seconds in half...
410 / 2 = 205 seconds

Answer 2

205 sec

Explanation:

x = sister

2x = Diana

2x = 410

x = 205

205 sec

hope this makes sense