Kelly and Sally both set off at 8 :30 am for Town P, 180 km away. Sally arrived at 100:30 am, ahead of Kelly. If Kelly traveled at a speed which was 10 km/h slower than Sally, the Kelly would have arrived in Town P at ________ PM.

Answer 1

it took Sally 2 hours to go 180 km.
That's 90 km/hr.

If Kelley traveled at 80 km/hr, it would take her 2.25 hr.

So, she would arrive at 10:45 am