Question

An aeroplane take 1 hour less for a journey of 1200 km if its speed is increased by 100 km/hrs from its usual speed. find the usual speed

Answer 1

$xx { {xx { { {?}^{2} }^{2} \times \frac{?}{?} \times \frac{?}{?} }^{2} }^{?} }^{?}$