83.5 km/hr

84.5 km/hr

86.5 km/hr

87.5 km/hr

D. 87.5 km/hr

Let the speeds of two trains be 7X and 8X km/hr.

$8X=\frac{400}{4}$

$\Rightarrow X=12.5Km/hr$

So speed of first train is 12.5*7 = 87.5 km/hr

9 km/hour

10 km/hour

11 km/hour

12 km/hour

8 kmph

11 kmph

12 kmph

14 kmph

83.5 km/hr

84.5 km/hr

86.5 km/hr

87.5 km/hr

$17\frac{6}{7}$ km/hr

25 km/hr

30 km/hr

35 km/hr

1 hr

2 hr

3 hr

4 hr

6 hours 24 mins

6 hours 21 mins

6 hours 18 mins

6 hours 15 mins

220 km

224 km

230 km

234 km

50 km

56 km

70 km

80 km

$35$

$36\frac{2}{3}$

$37\frac{1}{2}$

$40$

44 km/hour

46 km/hour

48 km/hour

50 km/hour

70.11 km/hr

71.11 km/hr

72.11 km/hr

73.11 km/hr

70 km/hr

75 km/hr

84 km/hr

87.5 km/hr

2 : 3

3 : 2

3 : 4

4 : 3

5 kmph

6 kmph

6.25 kmph

7.5 kmph

7:15 am

7:30 am

7: 42 am

7:50 am

100 kmph

110 kmph

120 kmph

130 kmph

50 meter

100 meter

110 meter

None of above

9

10

12

20

60 km/hr

100 km/hr

110 km/hr

120 km/hr

300 kmph

360 kmph

600 kmph

720 kmph

3.6

7.2

8.4

10

35.55 km/hr

36 km/hr

71.11 km/hr

71 km/hr

3 km

4 km

6 km

9 km

3 hours

2.4 hours

1.4 hours

1 hour

14 km

15 km

16 km

17 km

10 am

11 am

12 pm

1 pm