Which of the following are in inverse proportion: (i)The number of workers on a job and the time to complete the job. (ii)The time taken for a journey and the distance travelled in a uniform speed. (iii)Area of cultivated land and the crop harvested. (iv)The time taken for a fixed journey and the speed of the vehicle. (v)The population of a country and the area of land per person.

A boat can go across a lake of length I and return in time To at a speed yo. On a rough day there is a uniform current moving with a speed y to help onward journey and impede the return journey. If the time taken to go across and return on the rough day is t/(t_0) then the ratio is :

Sameera was driving a car with uniform speed of 60 kmph. Draw distance-time graph. From the graph find the distance travelled by Sameera in (i) (1)1/2 hours (ii) 2 hours (iii) (3)1/2 hours

A courier-person cycles from a tower to a neighbouring suburban area to deliver a parcel to a merchant.His distance from the town at different times is shown by the following graph.(a)What is the scale taken for the time axis? (b)How much time did the person take for the travel? (c)How far is the place of the merchant from the town? (d)Did the person stop on his way?Explain. (e)During which period did he ride fastest?