Question

An athlete cover a certain distance in 30 minutes at the uniform speed of 12km hr. By how much he must increase his speed so as to cover the same distance five minutes early?

Answer 1

Answer: 60 km/h

.

.v=12 km/h

T= 30 min or 30/60h

Therefore

distance = 6 km

( as distance = speed x time )

.

Now d = 6km

Time = 5 min or 5/60h

Therefore speed = 72 km/h

.

Speed increased = 72-12 = 60 m/s