Question

Hari took 20 minutes to walk 3 km. If Shyam is 20% faster than Hari, how much time will be take to cover the same .

Answer 1

speed of Hari = distance/time
=3000/1200 = 2.5m/sec
speed of Shyam = 2.5 + (0.2×2.5) = 2.5 + 0.5 = 3m/sec
now, for Shyam
time = distance/speed = 3000/3 = 1000sec
=16min 40 sec