How much time it will take for he solar radiation to reach Mars? (A) 10min (B) 12.6min (C) 15min (D) 14.8m

It takes 15 min to completely fill an oil tank. However the oil tank is being used via an outlet in the tank which can empty it in 30 min. If this outlet is open, how much time will it take to fill the tank completely? (A) 20 min (B) 25 min (C ) 30 min (D) 40 min

The area of a square field is 24200 sq m. How long will a lady take to cross the field diagonally at the rate of 6.6 km/h ? (A) 3 min (B) 2 min (C ) 2.4 min (D) 2 min 40 s

A cylindrical vessel of radius 0.5 m is filled with oil at the rate of 0.25 m3/minute. The rate at which the surface of the oil is rising, is (a) 1 m/min. (b) 2 m/min. (c) 5 m/min. (d) 1.25 m/min.

For a first order reactions, the half -life is 10 mins. How much time in minutes will it take to reduce the concentration of reactant to 25% of its original concentration ?

Two pipes A and B can fill a tank in 12 and 16 minutes respectively. Both pipes are opened together, but 4 min before the tank is full, pipe A is closed. In how many minutes will the tank be full? (A) 9 min B sec (B) 10 min 9 sec (C) 11 min 19 sec (D) 11 min 29 sec

In order to reach his office on time, Mr. Roy goes through the middle passage of a round fort which he takes 14 minutes to pass through. However, on a certain day, due to repairs, the straight road being blocked, he had to take the roundabout way as a result of which he reached his office late. How late was he? (a) 6 min (b) 8 min (c) 12 min (d) 7 1/2 min

Two pipes. A and B. can fill a tank in X minutes and 6 minutes, respectively. If both the pipes are used together, then they take 1.5 minute To fill the tank. Find the value of X. (a)1 min (b)4 min (c)5 min (d)2 min

A can go round a circular path 8 xx in 40 minutes.If the diameter of the circle is increased to 10 xx the original diameter, then the time required by A to go round the new path once,travelling at the same speed as before,is (a) 20min.(b) 25min.(c) 50 min.(d) 100 min.

A man runs round a circular field of radius 50m at the speed of 12km/hr .What is the time taken by the man to take twenty rounds of the field? (a) 30min.(b) 32min.(c) 34 min.(d) None of these

An express train travelled at a average speed of 100 kmph, stopping for 3 minutes after every 75 km. How long did it take to reach its destination 600 km from the starting point? (a) 6 hrs 21 min (b) 6 hrs 24 min (c) 6 hrs 27 min (d) 6 hrs 30 min