The ratio between the speed of Menna and Tenna is 2 : 3. Meena takes 20 min more than Tenna to walk from A to B. If Menna had walked at double the speed, find the time she would take to from A to B.?

Since, ratio of speeds of Meena and teena is 2 : 3.
∴ Ratio of time taken = 3 : 2
If, Teena takes x min to walk from A to B, then Meena takes (x + 20) min.
∴ (x + 20)/x = 3/2 ⇒ 2x + 40 = 3x
∴ x = 40 min
Hence, Meena takes 60 min walking at her usual speed and at double the speed, she would take 30 min.