Question

1. A man takes 30 minutes to 2 points
cover a certain distance at the
speed of 3 km/hr . By how
much should he increase his
speed to cover the distance in
20 minutes?
O 1.5 km/hy
1km/hr
2km/hr
in 21
2 points​

Answer 1

V(1) = 3 kmph ; t = 30 min

S = Vt = 3×30/60 = 1.5 km

S = 1.5 km ; t = 20 min

V(2) = S/t = 1.5×60/20 = 4.5 kmph

∆V = V(2) - V(1) = 4.5 - 3 = 1.5 kmph