Distance traveled by the plane flying towards north in 11/2 hrs
= 1000 x 1\( \frac{1}2\) =1500km
Similarly Distance traveled by the plane flying towards west in 11/2hrs
= 1200 x 1 \( \frac{1}2\) =1800 km
Let this distance is represented by OA and OB
Distance between these place after 1\( \frac{1}2\)hrs AB = \(\sqrt{{OA^2+OB^2}}\)
=300 x 7.8102
= 2343.07 km
So, distance between these places will be 2343 km (Approx) km, after 1 1/2 hrs