only (ii)
both (i) and (iii)
both (ii) and (iii)
all (i), (ii) and (iii)
15 m/sec
25 m/sec
40 m/sec
50 m/sec
less than 50%
more than 50%
more than 66.67%
equal to 100%
50 and 75
75 and 50
75 and 75
50 and 50
30
50
60
80