Solution:
Distance travelled by first aeroplane in
1 1/2 hours = 300 × 3/2 km = 450 km
and that by second aeroplane =
(400 × 3)/2 km = 600 km
Position of the two aeroplane after 1 1/2 hours would be A and B as shown in Fig. 6.14.
Thus, the two aeroplanes will be 750 km apart after1 1/2 hours.