Some machines complete the work in 4 days. But if 4 other machines are included in this work, then the job shall be completed in 2 days. If capacities of all machines are same, then in how many days 2 machines can complete this work ?
In every hour, a cyclist covered 1 km more distance than he was to cover with his original speed on $1×1/4$ hour. So he covered 96 km distance early by 2 hours. The original speed of cyclist (km/hr) is