Question

6. Delhi metro covers a distance in 40 min, if it runs at a speed of 48 km/h on an average. Find the speed at which the train must run to reduce the time of journey to 32 min. (1) 60 km/h (2) 50 km/h (3) 70 km/h (4) 80 km/h

11th - 12th Class

Maths

Solution

134

4.0 (1 ratings)

6. (1)( because ) Distance ( = ) Speed ( times ) Time ( =48 times frac{40}{60} ) ( =32 mathrm{km} ) ( therefore ) New speed ( =frac{text { Distance }}{text { Time }}=frac{32}{frac{32}{60}} ) ( =60 mathrm{km} / mathrm{h} )