Mary jogs 9 km at a speed of 6 km per hour. At what speed would she need to jog during the next 1.5 hours to have an average of 9 km per hour for the entire jogging session?
9 kmph
13 kmph
12 kmph
15 kmph
A car travelling with \[\frac{5}{7}\] of its actual speed covers 42 km in 1 hr 40 min 48 sec. Find the actual speed of the car.
17 km/hr
35 km/hr
31 km/hr
32 km/hr
How many kilograms of sugar costing Rs. 9 per kg must be mixed with 27 kg of sugar costing Rs. 7 per kg so that there may be a gain of 10 % by selling the mixture at Rs. 9.24 per kg?
A man can reach a certain place in 30 hours. If he reduces his speed by \[\frac{1}{15}th\], he goes 10 km less in that time. Find his speed.
7 km/hr
5 km/hr
52 km/hr
8 km/hr
In what ratio must a grocer mix two varieties of tea worth Rs. 60 a kg and Rs. 65 a kg so that by selling the mixture at Rs. 68.20 a kg he may gain 10 % ?