`A` can go round a circular path 8 times in 40 minutes. If the diameter of the circle is increased to 10 times 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) 20 min. (b) 25 min. (c) 50 min. (d) 100 min.

A can go round a circular path 8 times in 40 minutes. If the diameter of the circle is increased to 10 times the original diameter, the time required by A to go round the new path once travelling at the same speed as before is :

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

Three boys can go on a circular pathway in 3min 20sec, 3min 40 sec and 4 min respectively. If they start simultaneously from same place and at the same time, when will they meet next?

Two cars A and B are going around concentric circular paths of tau_(A) and tau_(B) . If the two cars complete the circular paths in the same time then the ratio of angular speeds of A and B is

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

A man increases his speed to 7/5times of his original speed and reaches his office 20 min before to fixed time, then find the usual time taken by him?

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