NCERT 2022 | मानव नेत्र तथा रंगबिरंगा संसार - L15 | CLASS 10 विज्ञान Ruchi Ma'am| 10 AM

Class 10 Chemistry all Important रासायनिक समीकरण तथा Topic सिर्फ 15 मिनट में

Pipes A,B and C can fill a tank in 15, 30 and 40 hours respectively. Pipes A,B and C are opened at 6 am 8 am and 10 am respectively on the same day, when will be tank be full? पाइप A, B और C क्रमशः 15, 30 और 40 घंटे में एक टैंक भर सकते हैं। पाइप A, B और C को उसी दिन क्रमशः सुबह 6 बजे सुबह 8 बजे और सुबह 10 बजे खोला जाता है, जब टैंक कब भर जाएगा

Four pipes can fill a reservoir in 15, 20, 30 and 60 hours respectively. The first pipe was opened at 8 am second at 9 am third at 10 am and fourth at 11 am. When will the reservoir be full? 1 pdotmdot b. 2 pdotmdot c. 2. 30 pdotmdot d. 3 pdotmdot

A clock goes slow from midnight by 5 minutes at the end of the first hour, by 10 minutes at the end of the second hour, by 15 minutes at the end of the third hour and so on. What will be the time by this clock after 6 hours? (a) 5.15 a.m. (b) 5.30 a.m. (c) 6 a.m. (d) 6.30 a.m.

The bells of three Churchs ring on the interval of 10, 12 and 15 minute respectively. If those ring at 8:30 A.M. together, then when will those ring next time together?

I went 15 m to the north, then I turned west and covered 10 m, then I turned south and covered 5 m and then turned east and covered 10 m. In which direction am I from the starting point ?

In a press, there are three types of printing machines, P, Q and R. Machine P can print 10,000 pages in 8 hours, machine Q can finish the same task in 10 hours and machine R can finish the same task in 15 hours. All the three machines start the work at 9 : 00 a. m. Machine P breaks down at 11 : 00 a.m. and machines Q and R finish the task. The approximate time of completion of the job is :