An electric bus has onboard instruments that report the total electricity consumed since the start of the trip as well as the total distance covered. During a single day of operation the bus travels on stretches M,N,O and P, in that order. The cumulative distances travelled and the corresponding electricity consumption are shown in the Table below:
|
Stretch
|
Cumulative distance (km)
|
Electricity used (kWh)
|
|
M
|
20
|
12
|
|
N
|
45
|
25
|
|
O
|
75
|
45
|
|
P
|
100
|
57
|
The stretch where the electricity consumption per km is minimum is
(a) M (b) N (c) O (d) P