Question

Find the speed in M/sec. distance = 60 km , time = 3 hrs.

Answer 1

distance = 60km= 60x10³
time= 3 hr= 3x60x60    (60 min = 1hr and 60 sec = 1 min)
speed = distance/tiime= 60x10³/3x60x60=1000/180
⇒100/18⇒50/9 m/s

Answer 2

First of all convert the units.................. 60km= 60×1000 m = 60000 m.................... 1 hr= 60min...... 3hr= 3×60min.= 180 min............. 1 min.= 60 sec....... So, 180 min.= 180×60= 10800 sec. ........................................................................................................................................... Speed= D/T........ Speed= 60000/10800 = 600/108 = 300/54= 150/27= 50/9 m/s= 5.55 m/s....